Schools of Thought
Philosophical Schools
A school of thought is a coherent set of answers to the questions reality forces on anyone who tries to describe it. Here each is interpreted through the same six dimensions — Time, Space, Matter, Observer, Energy, and Information — so that traditions that never spoke to one another can be set side by side. Filter by attribute to discover patterns across traditions: who treats time as illusory, who takes information as fundamental, and where the unexpected agreements lie.
All 208 of 208 schools
Realism
Realism holds that reality exists independently of human perception and thought. G. E. Moore's 'A Defence of Common Sense' (1925) and 'Proof of an External World' (1939) argued that ordinary objects — hands, tables, trees …
Idealism
Idealism holds that reality is fundamentally mental or spiritual rather than material. George Berkeley's 'Three Dialogues between Hylas and Philonous' (1713) and 'A Treatise Concerning the Principles of Human Knowledge' (1710) advanced the thesis esse …
Existentialism
Existentialism holds that existence precedes essence — human beings are not born with a fixed nature but must create themselves through free choice and commitment. Soren Kierkegaard's 'Either/Or' (1843) and 'Fear and Trembling' (1843) inaugurated …
Pragmatism
Pragmatism holds that the meaning and truth of any idea lie in its practical consequences. Charles Sanders Peirce's 'How to Make Our Ideas Clear' (1878) founded the movement by proposing that a concept's content is …
Phenomenology
Phenomenology investigates the structures of consciousness and the essential features of phenomena as they appear to experience. Edmund Husserl's 'Logical Investigations' (1900-01) and 'Ideas Pertaining to a Pure Phenomenology' (1913) established the method: bracket all …
Relativism
Relativism holds that truth, knowledge, and value are not absolute but vary according to the perspective, culture, or conceptual framework of the observer. The doctrine traces to Protagoras's famous dictum, preserved in Plato's 'Theaetetus', that …
Determinism
Determinism holds that every event, including every human thought and action, is the inevitable consequence of prior causes operating according to fixed natural laws. Baruch Spinoza's 'Ethics' (1677) provided the foundational metaphysics: God and Nature …
Presentism
Presentism holds that only the present exists — the past has ceased to be and the future has not yet come into being, making the razor-thin "now" the totality of reality. C. D. Broad's 'Scientific …
Eternalism
Eternalism holds that past, present, and future events are equally real — the universe is a four-dimensional "block" in which all times coexist. The view draws powerful support from Einstein's special theory of relativity (1905), …
Multiverse Theory
Multiverse Theory holds that our universe is one among many — possibly infinitely many — parallel realities, each potentially governed by different physical laws and constants. Hugh Everett III's doctoral thesis 'Relative State Formulation of …
Simulation Theory
Simulation Theory posits that what we take to be physical reality may be an artificial simulation running on the computational substrate of a more fundamental reality. The philosophical lineage begins with Rene Descartes's 'Meditations on …
Naturalism
Naturalism holds that everything that exists is part of the natural world, and that the methods of the natural sciences are the only reliable path to knowledge — supernatural explanations are excluded as a matter …
Relationalism
Relationalism holds that space and time have no independent existence — they are nothing but the totality of spatial and temporal relations among objects and events. Gottfried Wilhelm Leibniz articulated the classic statement in his …
Quantum Realism
Quantum Realism holds that the quantum description of reality is complete and fundamental — the world is genuinely indeterminate, entangled, and observer-dependent at its deepest level. Niels Bohr developed the Copenhagen interpretation through papers and …
Dualism
Dualism holds that reality consists of two fundamentally distinct substances: matter (res extensa) and mind (res cogitans), neither reducible to the other. Rene Descartes's 'Meditations on First Philosophy' (1641) provided the canonical argument: through radical …
Panpsychism
Panpsychism holds that consciousness or mentality is a universal and fundamental feature of reality — not exclusive to brains but present, in some form, in all things. Gottfried Wilhelm Leibniz's 'Monadology' (1714) proposed that reality …
Pragmatic Realism
Pragmatic Realism combines a realist commitment to a mind-independent world with the pragmatist insight that our access to that world is always shaped by human interests, concepts, and purposes. Hilary Putnam developed this position across …
Process Philosophy
Process Philosophy holds that reality is fundamentally constituted by dynamic processes of becoming rather than static substances or fixed things. Henri Bergson's 'Time and Free Will' (1889) and 'Creative Evolution' (1907) argued that lived duration …
Structuralism
Ontic Structural Realism holds that the fundamental constituents of physical reality are not objects with intrinsic properties but structures — patterns of relations that are ontologically prior to any relata. James Ladyman and Don Ross's …
Postmodernism
Postmodernism rejects the grand narratives of progress, reason, and objective truth that defined modernity, holding instead that reality is fragmented, plural, and constituted through language and power. Jean-Francois Lyotard's 'The Postmodern Condition' (1979) defined postmodernity …
Dialectical Materialism
Dialectical Materialism holds that reality is fundamentally material and develops through contradictions — opposing forces whose conflict drives all change in nature, society, and thought. Karl Marx's 'Capital' (1867) demonstrated this method in action, analyzing …
Absurdism
Absurdism holds that human beings are driven by a deep need for meaning, clarity, and purpose, yet inhabit a universe that remains stubbornly silent — and the confrontation between these two constitutes "the absurd." Albert …
Phenomenalism
Phenomenalism holds that physical objects are nothing more than stable patterns of actual and possible sensory experiences — to talk about a table is really to talk about the visual, tactile, and auditory sensations one …
Critical Realism
Critical Realism combines a realist ontology — reality exists independently of our knowledge of it — with a critical epistemology that recognizes all knowledge as historically situated and fallible. Roy Bhaskar's 'A Realist Theory of …
Empiricism
Empiricism holds that all substantive knowledge originates in sensory experience — the mind at birth is a blank slate (tabula rasa) that receives its content from the world through perception. Francis Bacon's 'Novum Organum' (1620) …
Rationalism
Rationalism holds that reason, rather than sensory experience, is the primary source of knowledge — certain fundamental truths can be known through the intellect alone, independently of observation. Rene Descartes's 'Meditations on First Philosophy' (1641) …
Transcendentalism
Transcendentalism holds that a spiritual reality transcends the material and empirical, accessible not through institutional religion or systematic philosophy but through individual intuition and direct communion with nature. Ralph Waldo Emerson's essay 'Nature' (1836) — …
Solipsism
Solipsism is the view that only one's own mind can be known to exist with certainty — the external world, other minds, and even one's own body may be nothing more than representations within consciousness. …
Buddhism
Buddhism, founded on the teachings of Siddhartha Gautama (the Buddha, c. 5th century BCE), holds that all conditioned phenomena are marked by three characteristics: impermanence (anicca), suffering (dukkha), and the absence of a permanent self …
Kantian Transcendental Idealism
Kantian Transcendental Idealism holds that the structure of experience — space, time, causality — is imposed by the mind rather than discovered in things themselves. Immanuel Kant's 'Critique of Pure Reason' (1781/1787), written in response …
Stoicism
Stoicism holds that the universe is governed by a rational, divine principle — the Logos — that pervades and orders all of nature, and that the good life consists in aligning one's will with this …
Constructivism
Constructivism holds that knowledge and reality are not passively discovered but actively constructed through cognitive, social, and cultural processes. Giambattista Vico's 'New Science' (1725) articulated an early form: we can truly know only what we …
Advaita Vedanta
Advaita Vedanta holds that ultimate reality is Brahman — pure, infinite, undivided consciousness — and that the individual self (Atman) is not merely similar to Brahman but identical with it: "Tat tvam asi" ("Thou art …
Catholic/Thomistic
Catholic/Thomistic philosophy synthesizes Aristotelian metaphysics with Christian theology into a unified account of reality as created, ordered, and sustained by God. Thomas Aquinas's 'Summa Theologiae' (1265-1274) is the monumental achievement of this synthesis: drawing on …
Nihilism
Nihilism holds that reality has no inherent meaning, purpose, or objective structure. Ivan Turgenev's novel 'Fathers and Sons' (1862) introduced the term to wide usage through the character Bazarov, a young radical who rejects all …
Reformed / Calvinist Theology
Reformed theology holds that the triune God of Scripture is the sovereign creator and sustainer of all reality, governing every event by providence while holding human beings genuinely responsible for their actions. John Calvin's 'Institutes …
Neo-Platonism
Neo-Platonism holds that all reality emanates hierarchically from a single, ineffable principle — the One — which is beyond being, thought, and description. Plotinus's 'Enneads' (compiled c. 270 CE by Porphyry) developed this into a …
Analytic Metaphysics / Logical Atomism
Logical Atomism holds that the world consists of logically independent atomic facts, and that an ideal logical language should mirror this structure with perfect transparency. Bertrand Russell's 'The Philosophy of Logical Atomism' (1918) argued that …
Logical Positivism
Logical Positivism held that a statement is cognitively meaningful only if it is either analytically true (true by definition or logic) or empirically verifiable in principle — all other claims, including those of metaphysics, theology, …
Taoism
Taoism holds that all reality flows from and returns to the Tao — the nameless, ungraspable source and pattern of all things, prior to heaven and earth. The 'Tao Te Ching' ('Daodejing'), attributed to Laozi …
Confucianism
Confucianism holds that moral cultivation is both the path to personal virtue and the foundation of social and political order. The 'Analects' ('Lunyu'), compiled by Confucius's (Kong Qiu, 551-479 BCE) disciples, presents his teachings through …
Jainism / Anekantavada
Jainism holds that reality is irreducibly multi-faceted (anekantavada — the doctrine of many-sidedness) and cannot be captured by any single perspective or proposition. Mahavira (c. 6th century BCE), the 24th Tirthankara, taught the foundational principles …
Samkhya
Samkhya is one of the oldest systematic philosophies of India, positing an atheistic dualism between two eternal, uncreated realities: Purusha (consciousness, passive and plural — each soul a distinct witness) and Prakriti (primordial matter, active …
Occasionalism
Occasionalism holds that no created substance possesses genuine causal power — God alone is the true cause of every event at every instant. Al-Ghazali's 'The Incoherence of the Philosophers' ('Tahafut al-Falasifa', 1095) provided the Islamic …
Object-Oriented Ontology (OOO)
Object-Oriented Ontology (OOO) maintains that all objects — human, animal, mineral, artificial, fictional — exist on an equal ontological footing, each withdrawing from full access by any other entity, including human consciousness. Graham Harman's 'Tool-Being: …
Pyrrhonism
Pyrrhonism practices the complete suspension of judgment (epoche) about all non-evident matters, seeking tranquility (ataraxia) through the cessation of dogmatic belief. The tradition originates with Pyrrho of Elis (c. 360-270 BCE), who, according to ancient …
Sufism / Wahdat al-Wujud
Wahdat al-Wujud (Unity of Being) holds that only God (al-Haqq, "the Real") truly exists, and that all creation is God's perpetual self-disclosure (tajalli) — real but not self-sustaining, possessing borrowed existence that depends at every …
Kabbalah (Lurianic)
Lurianic Kabbalah teaches that God (Ein Sof, "the Infinite") created reality through Tzimtzum — a primordial contraction or withdrawal of divine light to make room for finite existence within the resulting void. Isaac Luria (1534-1572), …
Hylomorphism
Hylomorphism holds that every physical substance is an irreducible composite of matter (hyle) and form (morphe) — matter provides the potentiality, form provides the actuality and intelligible structure that makes a thing what it is. …
Neutral Monism
Neutral Monism holds that the fundamental substance of reality is neither mental nor physical but a third, neutral kind from which both mind and matter emerge as different arrangements or aspects. Baruch Spinoza's 'Ethics' (1677) …
Yogacara
Yogacara (Consciousness-Only, Vijnanavada) holds that all phenomena are transformations of consciousness — there is no external material world independent of mind. Asanga's 'Mahayanasamgraha' ('Compendium of the Great Vehicle', c. 4th century CE) systematized the school's …
Zoroastrianism
Zoroastrianism, founded on the teachings of Zoroaster (Zarathustra, c. 1500-500 BCE), posits a cosmic dualism between Ahura Mazda (the Wise Lord, source of truth, light, and goodness) and Angra Mainyu (the Destructive Spirit, source of …
Deep Ecology
Deep Ecology holds that all living beings possess intrinsic value independent of their utility to humans, and that the ecological crisis demands a fundamental shift in consciousness rather than mere technical management. Arne Naess's seminal …
Dataism / Information Ontology
Dataism holds that reality is fundamentally information or computation — matter, energy, space, and time are emergent expressions of underlying information-processing. John Archibald Wheeler's influential essay 'Information, Physics, Quantum: The Search for Links' (1990) crystallized …
Animism / Relational-Indigenous Worldview
Animism understands the natural world as populated by persons — animal persons, plant persons, river persons, mountain persons — each possessing agency, interiority, and relational standing within a living cosmos. Philippe Descola's 'Beyond Nature and …
Ubuntu / African Communal Ontology
"I am because we are" (umuntu ngumuntu ngabantu). Ubuntu holds that personhood is constituted by communal relations rather than individual substance — a person becomes a person through other persons. Mogobe Ramose's 'African Philosophy Through …
Transhumanism / Posthumanism
Transhumanism holds that the human condition — mortality, cognitive limitation, physical frailty — is a temporary engineering problem rather than a fixed essence, and that technology can and should be used to radically enhance human …
Psychedelic / Entheogenic Worldview
The psychedelic or entheogenic worldview holds that ordinary waking consciousness is a narrow filter on a vaster, multidimensional reality, and that altered states of consciousness — induced by entheogens, meditation, or breathwork — can lift …
Afrofuturism
Afrofuturism and Black Quantum Futurism hold that time is culturally constituted and actively manipulable — past, present, and future are simultaneously accessible through creative and communal practice, making history a site of liberation rather than …
Virtual Realism
The Gamer or Virtual-Realist worldview treats multiple simultaneous realities as normal and navigable — physics is rule-set-dependent and varies across worlds, identity is avatar-based, mutable, and plural, and the distinction between "real" and "virtual" is …
Energetic Wellness Worldview
The Wellness or Energetic worldview holds that reality is fundamentally energy or vibration, and that consciousness can directly perceive and manipulate this energy to shape health, experience, and material circumstances. Deepak Chopra's 'Quantum Healing' (1989) …
LDS / Latter-day Saint Theology
Latter-day Saint theology, rooted in the revelations of Joseph Smith and systematized by early theologians such as Parley P. Pratt and Brigham Young, holds that God, humanity, and the material universe share a common ontological …
Jewish Philosophy (Maimonidean)
Medieval Jewish philosophy, supremely represented by Moses Maimonides (1138–1204) in the 'Guide for the Perplexed' and the 'Mishneh Torah,' synthesized Aristotelian metaphysics with biblical monotheism to produce a rigorously rationalist theology. Saadia Gaon's 'Book of …
Eastern Orthodox Christianity
Eastern Orthodox theology, drawing on the Greek Church Fathers and crystallized in the Palamite synthesis of the fourteenth century, holds that God is utterly transcendent in essence yet genuinely present in creation through the uncreated …
Islamic Philosophy / Falsafa
Islamic philosophy (falsafa), developed by al-Farabi (c. 872–950), Avicenna (Ibn Sina, 980–1037), and Averroes (Ibn Rushd, 1126–1198), represents the most ambitious synthesis of Aristotelian and Neoplatonic philosophy with Islamic monotheism. Avicenna’s masterwork, the 'Kitab al-Shifa' …
Shintoism
Shinto, the indigenous spiritual tradition of Japan, holds that reality is pervaded by kami — sacred powers or presences that dwell in natural phenomena, ancestors, and extraordinary human beings. There is no sharp ontological boundary …
Sikhism
Sikhism, founded by Guru Nanak (1469–1539) and developed through ten human Gurus culminating in the eternal Guru Granth Sahib, holds that one supreme, formless, timeless reality — Ik Onkar (One God) — pervades and sustains …
Epicureanism
Epicureanism, founded by Epicurus (341–270 BCE) and magnificently expounded by Lucretius in 'De Rerum Natura' (c. 55 BCE), holds that reality consists entirely of atoms (atoma — indivisible, indestructible particles) and void (kenon — empty …
Dvaita Vedanta
Dvaita Vedanta, founded by Madhvacharya (1238–1317) and systematized by Jayatirtha (1345–1388), holds that God (Vishnu/Narayana), individual souls (jivas), and the material world (prakriti) are three eternally and irreducibly distinct realities. Against Shankara’s Advaita (non-dualism), which …
Platonism (Classical)
Classical Platonism, founded by Plato (c. 428–348 BCE) in the dialogues — above all the 'Republic,' 'Phaedo,' 'Timaeus,' and 'Symposium' — holds that the highest realities are the Forms (eide): eternal, immutable, non-physical archetypes of …
Baha'i Faith
The Baha'i Faith, founded by Baha'u'llah (1817–1892) and authoritatively interpreted by 'Abdu'l-Baha (1844–1921), holds that there is one God, unknowable in essence, who has progressively revealed divine truth to humanity through a series of Manifestations …
Hermeticism
Hermeticism, rooted in the 'Corpus Hermeticum' and the 'Emerald Tablet' attributed to Hermes Trismegistus (a syncretic figure blending the Egyptian god Thoth with the Greek Hermes), holds that reality is a unified, living cosmos in …
Manichaeism
Manichaeism, founded by the Prophet Mani (216–274/277 CE) in Sassanid Persia and once the most geographically widespread religion in the world (stretching from Roman North Africa to Tang Dynasty China), holds that reality is constituted …
African Traditional Religion / Yoruba-Ifa
The Yoruba-Ifa tradition, one of the great religious and philosophical systems of West Africa, centers on the figure of Orunmila (the deity of wisdom and divination) and the Ifa corpus — an immense oral library …
Deism
Deism holds that a supreme intelligent being created the universe and established its natural laws but does not intervene in its subsequent operation — no miracles, no prophecy, no revelation, no answered prayers. The universe …
Lutheranism
Lutheranism holds that the triune God is the creator and sustainer of all reality, but that human beings can know this God only through the revelation of Jesus Christ as attested in Holy Scripture — …
Tibetan Vajrayana Buddhism
Tibetan Vajrayana Buddhism is the Indo-Tibetan tantric tradition that took shape on the Tibetan plateau from the eighth century onward, drawing the Madhyamaka philosophy of Nagarjuna together with the Yogachara doctrine of buddha-nature (tathagatagarbha) and …
Pure Land Buddhism
Pure Land Buddhism is the East Asian devotional tradition centered on Amitabha (Chinese Amituofo, Japanese Amida) Buddha and his primal vow to receive into his Pure Land (Sukhavati, the Land of Bliss) all beings who …
Process Theology
Process Theology is the Christian theological tradition that develops the process philosophy of Alfred North Whitehead — articulated in 'Process and Reality' (1929) — into an explicitly theistic and personalist account of God, world, and …
Spinozist Pantheism
Spinozist Pantheism is the metaphysical position, given systematic form by Baruch Spinoza in his 'Ethics' (1677) and recovered for the Romantic and modern eras through the Pantheismusstreit of the 1780s, that there is exactly one …
Pythagoreanism
Pythagoreanism is the philosophical-religious tradition founded by Pythagoras of Samos in the sixth century BCE, which held that number is the fundamental principle of reality, that the cosmos is structured by mathematical-musical harmony, that the …
Christian Personalism
Christian Personalism is the twentieth-century theological-philosophical movement that takes the person — divine and human — as the irreducible primary category of metaphysics, ethics, and politics, and develops its doctrines through the integration of classical …
Evangelical Protestantism
Evangelical Protestantism is the broad transdenominational tradition that descends from the eighteenth-century Anglo-American revivals, gathering Baptists, Methodists (Wesleyan), low-church Anglicans, Pentecostals, charismatics, the evangelical-free, and the vast world of independent non-denominational congregations. Its defining commitments …
Liberal Theology
Liberal Theology is the modernist Protestant tradition that begins with Friedrich Schleiermacher's 'On Religion: Speeches to its Cultured Despisers' (1799) and 'The Christian Faith' (1821-22), which relocates the ground of religion from propositional revelation or …
Liberation Theology
Liberation Theology is the family of late-twentieth-century Christian theologies that read the gospel from the underside of history — from the perspective of the poor, the colonized, the racialized, and the oppressed — and insist …
Christian Existentialism
Christian Existentialism is the philosophical-theological tradition that takes existentialism's categories of anxiety, decision, finitude, authenticity, and the irreducible particularity of the existing individual and works them out within the substantive commitments of Christian theology: a …
Humanism
Humanism centres the human person — her dignity, her capacity for reason, her flourishing across history — as the relevant unit of philosophical and ethical concern. Renaissance humanism recovered classical letters as a school for …
Critical Theory
Critical Theory is the tradition that emerged from the Institute for Social Research in Frankfurt: a synthesis of Marx, Freud, and Hegelian dialectic aimed at diagnosing the pathologies of late-modern capitalist and bureaucratic societies. Its …
Romanticism
Romanticism is the broad movement that arose in response to Enlightenment rationalism, asserting the priority of feeling, imagination, the organic, the historical, and the unconscious depths of the self over mechanistic explanation and abstract universal …
Historicism
Historicism is the position that human beings, their institutions, and their categories of thought are constitutively historical — formed by specific times and places and intelligible only through those formations. Strong historicism extends this to …
Mysticism
Mysticism is the cross-traditional family of doctrines and practices oriented toward direct, ineffable union or identification with ultimate reality — variously named God, Brahman, the One, Suchness. It is characterised by apophatic discourse (negation of …
Christianity (Generic)
Generic Christianity names the shared theological substrate held in common by the historic Christian traditions: belief in one God revealed in the Trinity (Father, Son, Holy Spirit); the incarnation, crucifixion, and resurrection of Jesus Christ; …
Modernism
Modernism is the broad cultural and intellectual movement that responded to the conditions of industrial modernity — the loss of religious cosmology, the velocity of the city, the trauma of the First World War — …
Liberalism
Liberalism is the political and ethical tradition that takes the individual person — her freedom, her rights, her equal standing under law — as the foundational unit of political reasoning, and seeks institutions (limited government, …
Hermeneutics
Hermeneutics is the philosophy of interpretation: the disciplined account of how texts, traditions, actions, and meanings are understood, and of the conditions that make understanding possible. In its philosophical form (Gadamer, Ricoeur) it argues that …
Rabbinic Judaism
Rabbinic Judaism is the form of Judaism that emerged after the destruction of the Second Temple (70 CE) and is structured around the dual Torah — Written (Tanakh) and Oral (Mishnah, Talmud, midrash) — interpreted …
Feminism
Feminism is the family of political, ethical, and analytical commitments that take the historical and ongoing subordination of women — and, increasingly, of gender-marginalised persons more broadly — as a fact requiring redress, and that …
Tragedy (Philosophical)
Tragedy as a philosophical position holds that the human condition is structurally exposed to losses and conflicts that no rational ordering, ethical system, or providential narrative can fully redeem. Tragic insight is the recognition that …
Psychoanalysis
Psychoanalysis is the family of theories and clinical practices that take the unconscious — its dynamics of repression, desire, defence, transference — as the primary explanatory framework for adult mental life. As a philosophical position, …
Aestheticism
Aestheticism is the position that beauty and aesthetic experience are intrinsic goods requiring no further justification — moral, religious, political, or utilitarian — and that the cultivation of refined aesthetic sensibility is a legitimate and …
Logicism
Logicism is the position in the philosophy of mathematics that mathematics is reducible to (or expressible in) pure logic — that arithmetic, in particular, is analytic and necessary in the same sense that logic is. …
Aristotelianism
Aristotelianism is the broad tradition that inherits Aristotle's metaphysics (substance, form, matter, the four causes), ethics (virtue, function, eudaimonia), politics, and natural philosophy. It is distinct from "hylomorphism" (already in this ontology, focused on form/matter …
Scholasticism
Scholasticism is the medieval and early-modern method of doing philosophy and theology within the university tradition: the careful exposition of authoritative texts (Scripture, the Fathers, Aristotle), the dialectical posing of objections and replies (quaestio disputata), …
Intersectionality
Intersectionality is the analytical framework holding that systems of power — racism, sexism, classism, ableism, heteronormativity, and others — do not operate independently but interact, producing experiences of subordination and privilege that cannot be analysed …
Cognitivism (Mind)
Cognitivism is the position in philosophy of mind and psychology that mental processes are best understood as computational operations on internal representations. It arose as the explicit alternative to behaviourism (which refused to talk of …
Protestant Reformation (Magisterial)
The Protestant Reformation here names the broad magisterial reform of the sixteenth-century Western church — Luther's and Calvin's critique of late-medieval Catholic doctrine and practice, the affirmation of justification by grace through faith alone, of …
Black Radical Tradition
The Black Radical Tradition is the lineage of intellectual and political work that takes the experience of African-descended peoples under racial capitalism — slavery, colonialism, segregation, mass incarceration, ongoing dispossession — as the analytic centre, …
Utilitarianism
Utilitarianism is the ethical view that the right action is the one that produces the greatest sum (or average) of well-being across all affected parties. It is a species of consequentialism characterised by impartial treatment …
Classical Greek Thought
Classical Greek thought is the broad cultural and intellectual framework of the Greek city-state world from the Presocratics through the classical philosophers: the conviction that the natural order is intelligible, that human beings are political …
Postcolonial Theory
Postcolonial theory is the body of intellectual work that takes the historical and continuing effects of European colonialism on colonised and formerly colonised peoples as a central object of analysis. It investigates how knowledge, language, …
Cybernetics
Cybernetics is the interdisciplinary study of regulatory and self-regulating systems — biological, mechanical, social — focused on feedback, control, communication, and self-organisation. First-order cybernetics studies observed systems; second-order cybernetics (von Foerster, Maturana) takes the observer …
Communitarianism
Communitarianism is the position that human beings are constitutively members of communities — families, neighbourhoods, religious bodies, nations — and that ethical and political reasoning that abstracts from these memberships produces both philosophical confusion and …
Behaviorism
Behaviorism is the position in psychology and philosophy of mind that psychological science should restrict itself to observable behaviour and its environmental determinants, refusing to invoke unobservable internal mental states. Methodological behaviorism brackets internal states; …
Hinduism (Generic)
Generic Hinduism names the broad religious and philosophical complex of the Indian subcontinent — its scriptural corpus (the Vedas, Upanishads, Bhagavad-Gita, Puranas, Itihasas), its devotional and ritual practices, and its philosophical schools — considered as …
Utopianism
Utopianism is the family of political and literary traditions that takes the imaginative construction of better social orders as a serious intellectual and emancipatory practice. It includes both blueprint utopias (detailed plans for radically reformed …
Islam (Generic)
Generic Islam names the religious tradition founded by Muhammad and articulated in the Qur'an (revealed 610–632 CE), the Sunnah (the prophetic example), and the schools of jurisprudence (fiqh) and theology (kalam). It holds the absolute …
Pietism
Pietism is the renewal movement within Lutheranism (and later other Protestant traditions) that emphasised personal piety, the new birth, devotional reading of Scripture, small-group fellowship (collegia pietatis), and practical Christian life over against confessional scholasticism. …
Conservatism
Conservatism is the political and philosophical tradition that takes inherited institutions, traditions, and practices as bearing accumulated wisdom and as warranting a presumption against radical reform. It distinguishes itself from reactionary politics (which seeks restoration …
Classical Liberalism
Classical liberalism is the political tradition that emphasises limited constitutional government, private property, free markets, the rule of law, civil and religious liberty, and a strong presumption against state interference in the lives of individuals. …
Queer Theory
Queer theory is the late-twentieth-century intellectual movement that takes the historical contingency, performativity, and instability of gender and sexual categories as its analytical object. It contests the natural-kind status of categories like "man," "woman," "heterosexual," …
Materialism (Philosophical)
Philosophical materialism is the position that the fundamental constituents of reality are material — physical bodies, particles, fields — and that whatever else exists (minds, values, abstract objects) is either reducible to, supervenient on, or …
Systems Theory
Systems theory is the interdisciplinary framework that takes the system — a bounded set of elements in patterned interaction — as the primary unit of analysis, and develops a common vocabulary (boundary, emergence, feedback, autopoiesis, …
Anarchism
Anarchism is the political tradition that refuses the legitimacy of coercive hierarchical authority — particularly the state, capitalist property, and patriarchal-clerical authority — and aspires to social orders constituted through voluntary cooperation, mutual aid, and …
Natural Law
Natural law is the position that there are real moral and legal norms grounded in human nature and accessible (in principle) to natural reason, independently of any particular positive law or revealed religion. Classical natural …
Cognitive Science
Cognitive science is the interdisciplinary scientific study of mind and cognition, integrating psychology, linguistics, philosophy of mind, artificial intelligence, neuroscience, and anthropology. Where cognitivism (a sister entry in this ontology) is a specific philosophical-theoretical commitment …
Behavioral Economics
Behavioral economics is the field that integrates findings from cognitive and social psychology into economic theory, modelling economic agents as boundedly rational — subject to systematic biases, framing effects, and heuristic-driven errors — rather than …
Pluralism
Pluralism is the position that reality, value, or both are irreducibly multiple — that no single principle, narrative, or framework can capture them whole. Metaphysical pluralism holds that being itself has multiple, irreducible kinds; value …
Anglican Broad-Church
Anglican Broad-Church is the strand of Anglicanism that has traditionally sought a comprehensive, latitudinarian middle way between high-church Anglo-Catholic and low-church Evangelical positions — emphasising the historical creeds, the spiritual depth of the sacraments, the …
Political Realism
Political realism is the tradition in political theory and international relations that treats power, interest, and the limits of moral reform as central to political analysis. It is distinguished here from "realism" in metaphysics (a …
Civic Republicanism
Civic republicanism is the political tradition that takes the cultivation of free, virtuous citizens within a self-governing political community as the central ethical-political project. It articulates freedom not primarily as non-interference (the liberal account) but …
Classicism
Classicism is the aesthetic and intellectual orientation that takes the literature, art, and rhetoric of Greco-Roman antiquity as enduring models — sources of formal discipline, balance, clarity, proportion, and decorum. It is distinguished from generic …
Philosophical Pessimism
Philosophical pessimism is the position that the world contains more suffering than well-being and that, on balance, non-existence would be preferable to existence — or at least that the standard optimistic narratives of progress, salvation, …
Consequentialism
Consequentialism is the meta-ethical family holding that the rightness of an action is determined entirely by its consequences. Utilitarianism is the most familiar consequentialist theory (handled separately); other variants (egoistic, satisficing, multidimensional, rule-) share the …
Classical Roman Thought
Classical Roman thought names the broad intellectual culture of the Roman Republic and Empire — its appropriation of Greek philosophy (Stoicism, Epicureanism, the New Academy), its development of distinctively Roman institutions of law and rhetoric, …
Evolutionism (Philosophical)
Philosophical evolutionism is the family of positions that takes the Darwinian framework — variation, selection, retention — as the central explanatory schema for understanding not just biological speciation but consciousness, culture, knowledge, and (in cosmic-evolutionist …
Deconstruction
Deconstruction is the philosophical practice associated with Derrida (and his various heirs) of patiently exposing how Western metaphysical and literary texts depend on conceptual oppositions (presence/absence, speech/writing, mind/body, masculine/feminine) that the texts themselves cannot finally …
Evolutionary Psychology
Evolutionary psychology is the research programme that takes the mind to be a collection of cognitive adaptations shaped by selection pressures in the ancestral environment (the "environment of evolutionary adaptedness"). It generates hypotheses about contemporary …
Virtue Ethics
Virtue ethics is the ethical tradition that takes the question "what kind of person should I be?" — rather than "what acts are right?" — as the central one. It analyses moral life in terms …
Deontological Ethics
Deontological ethics is the family of moral theories holding that some acts are right or wrong intrinsically — by their conformity or violation of moral duties or constraints — rather than only by their consequences. …
Scientism
Scientism is the position that the methods, vocabulary, and findings of the natural sciences are the only or supremely reliable route to knowledge about reality, and that other apparent sources (religious revelation, traditional moral wisdom, …
Atheism / Secularism
Atheism is the position that no gods exist; secularism is the political and cultural position that public institutions should be organised independently of religious authority. The two are related but distinct: a non-atheist can be …
Lebensphilosophie (Philosophy of Life)
Lebensphilosophie ("philosophy of life") is the late-nineteenth and early-twentieth-century European movement that took the living, temporal, irreducibly experiential reality of life — rather than the timeless propositions of system-philosophy or the abstractions of natural science …
Legalism (Fa-jia)
Legalism (fa-jia, 法家) is the ancient Chinese political-philosophical school that takes the impersonal rule of law (fa), administrative technique (shu), and the strategic deployment of power (shi) as the proper instruments of political order. Against …
Mohism
Mohism is the ancient Chinese school founded by Mozi (Mo Di) that opposed the Confucian emphasis on graded familial love and ritual propriety with a universalist ethic of "impartial care" (jian ai) and an utilitarian …
Formalism (Mathematical)
Mathematical formalism is the position in the foundations of mathematics that mathematics is the rule-governed manipulation of finite strings of symbols according to specified inference rules, and that mathematical "truth" reduces to provability within formal …
Animal Ethics
Animal ethics is the field that takes the moral standing of non-human animals — their interests, their capacities for suffering, their proper treatment by human institutions — as a serious philosophical and practical subject. Its …
Christian Platonism
Christian Platonism is the long-standing tradition that has read Christian revelation in dialogue with — and as fulfilling — the Platonic philosophical heritage. It holds that the One of Plotinus is intelligibly identified with the …
Pacifism
Pacifism is the moral and political position that participation in war and violent coercion is impermissible — either absolutely (principled pacifism) or in all empirical circumstances likely to arise (consequentialist pacifism). Christian pacifism roots the …
Libertarian Socialism
Libertarian socialism is the tradition that combines a socialist critique of capitalism (private ownership of the means of production produces exploitation, alienation, and unfreedom) with a libertarian critique of the state (centralised authority reproduces domination …
Perennial Philosophy
The perennial philosophy is the position that there exists a common, transcendent metaphysical core underlying the world's major contemplative and mystical traditions — that the Christian via negativa, Sufi tawhid, Vedantic non-dualism, Buddhist śūnyatā, and …
Analytical Psychology (Jungian)
Analytical psychology is the distinctive depth-psychological framework developed by C.G. Jung as an alternative to Freudian psychoanalysis. It posits a collective unconscious populated by archetypes — universal symbolic patterns inherited rather than learned — and …
Natural Theology
Natural theology is the project of reasoning to claims about God — God's existence, attributes, and providential ordering of the world — from premises available to natural reason alone, without appeal to revelation. Its canonical …
Philosophy of Mind
Philosophy of mind is the systematic study of the nature of mind, mental states, consciousness, intentionality, and the relation between mind and body or brain. Its central problems include the mind-body problem (how mental phenomena …
Philosophy of Science
Philosophy of science is the systematic study of scientific reasoning, methodology, theory-structure, theory-change, scientific realism, the demarcation of science from non-science, the role of values in inquiry, and the relations among the natural and social …
Philosophy of Language
Philosophy of language is the systematic study of meaning, reference, truth, and the relations among language, mind, and world. Its central problems include the theory of reference (descriptivism vs. direct reference, Kripke's causal-historical chains), the …
Philosophy of Religion
Philosophy of religion is the systematic study of religious concepts and practices using philosophical methods. Its central topics include the existence and attributes of God (cosmological, ontological, design, moral, and noological arguments and their critiques), …
Cosmopolitanism
Cosmopolitanism is the political-philosophical view that all human beings, regardless of nationality, race, or culture, belong to a single moral community — a universal humanity owed mutual respect, moral consideration, and (on stronger versions) political …
Analytic Philosophy
Analytic Philosophy designates the broad twentieth-century tradition that took the logical analysis of language as the primary tool of philosophical inquiry. Gottlob Frege's 'Begriffsschrift' (1879) and 'Die Grundlagen der Arithmetik' (1884) furnished the new logic …
Continental Philosophy
Continental Philosophy is the self-conscious counter-tradition to analytic philosophy, gathering the major post-Kantian European movements — German idealism, phenomenology, hermeneutics, existentialism, Western Marxism, critical theory, structuralism, and post-structuralism — into a loose but recognisable family. …
Post-Structuralism
Post-Structuralism is the wave of French thought that emerged in the late 1960s as both an extension and a critique of the structuralism of Saussure and Lévi-Strauss, dismantling the assumption that stable structures — linguistic, …
Hegelianism
Hegelianism is the systematic philosophy elaborated by Georg Wilhelm Friedrich Hegel in the early nineteenth century and carried forward by his immediate school. Its monumental statements are the 'Phenomenology of Spirit' (1807), which traces the …
Cartesianism
Cartesianism is the seventeenth-century rationalist school founded by René Descartes and developed by his immediate followers in France and the Low Countries. Descartes's 'Discourse on the Method' (1637), 'Meditations on First Philosophy' (1641), and 'Principles …
Modal Realism
Modal Realism is the metaphysical thesis, defended in its sharpest form by David Lewis, that every way the world could have been is a way that some concrete world actually is. Lewis's 'Counterfactuals' (1973) introduced …
Mechanism
Mechanism is the early modern doctrine that nature is at bottom a vast machine of matter in motion, all of whose phenomena are to be explained by the size, shape, position, and movement of material …
Atomism
Atomism is the philosophical doctrine that reality consists fundamentally of indivisible particles — atoms — moving in an otherwise empty void. Originating in the fifth century BCE with Leucippus and Democritus, it was systematised in …
Nominalism
Nominalism is the metaphysical thesis that only particulars exist, and that universals — properties, kinds, and abstract objects considered as entities in their own right — are at best names (nomina) or general terms that …
British Idealism
British Idealism is the late nineteenth and early twentieth century revival of Hegelian and broadly post-Kantian absolute idealism in the English-speaking philosophical world, dominant in Oxford and the wider British academy from roughly 1870 to …
Christian Mysticism
Christian mysticism is the contemplative tradition that seeks direct, transformative, often unitive experience of God within an orthodox Trinitarian and incarnational framework. The Syrian author known as Pseudo-Dionysius the Areopagite, writing around 500 CE, set …
Catholicism
Catholicism is the comprehensive ecclesial worldview of the Roman Catholic Church: sacramental, hierarchical, magisterial, and traditionalist, holding that the fullness of Christian revelation subsists in the visible Church gathered around the Bishop of Rome as …
Anglicanism
Anglicanism is the via media tradition of the Church of England and the worldwide Anglican Communion, defined liturgically by the Book of Common Prayer, doctrinally by the Thirty-Nine Articles, and ethically by the threefold appeal …
Methodism
Methodism is the Wesleyan revivalist tradition that emerged from the eighteenth-century evangelical awakening within the Church of England and grew into a worldwide family of churches centered on the doctrines of universal prevenient grace, personal …
Biblicism
Biblicism is the conviction that the Bible, in its original autographs, is the sole, sufficient, and inerrant norm for Christian faith and practice — sola Scriptura pushed to its strongest form. The tradition has roots …
Southern Baptist / Baptist Tradition
The Baptist tradition is a family of Protestant churches characterized by believer's baptism by immersion, congregational polity, the priesthood of all believers, soul liberty, and (in the conservative wing) the inerrancy of Scripture. The English …
Arminianism
Arminianism is the early seventeenth-century Reformed reaction against the high Calvinism of Theodore Beza and the Synod of Dort, articulating an alternative soteriology in which divine election is conditional on foreseen faith, grace is genuinely …
Neo-Orthodoxy
Neo-orthodoxy — also called dialectical theology, the theology of crisis, or kerygmatic theology — was the twentieth-century Protestant reaction against nineteenth-century liberal Protestantism's domestication of God within human religious experience. The decisive opening shot was …
Radical Reformation / Anabaptism
The Radical Reformation is the sixteenth-century Anabaptist movement that broke not only with Rome but also with the magisterial Reformers (Luther, Zwingli, Calvin), insisting on a believers' church separated from civil authority, on adult baptism …
Thomism
Thomism is the continuous philosophical-theological tradition that takes the works of Thomas Aquinas — above all the 'Summa Theologiae' (1265-1274), the 'Summa Contra Gentiles' (1259-1265), and the disputed questions 'De Veritate' (1256-1259) and 'De Potentia' …
Transcendental Thomism
Transcendental Thomism is the twentieth-century attempt to defend the metaphysics of Thomas Aquinas by appropriating the transcendental method of Immanuel Kant and his post-Kantian heirs — that is, by grounding metaphysics in a critical analysis …
Augustinianism
Augustinianism is the long philosophical-theological tradition descended from Augustine of Hippo (354-430), whose 'Confessions' (c. 397-400), 'De Trinitate' (399-419), and 'De Civitate Dei' ('City of God', 413-426) defined a distinctive Latin Christian vision of God, …
Latin Averroism
Latin Averroism is the philosophical movement in the thirteenth- and fourteenth-century arts faculties of Paris and Padua that took the commentaries of Ibn Rushd (Averroes, 1126-1198) on Aristotle as the authoritative reading of the Philosopher, …
Gnosticism
Gnosticism is the family of ancient religious movements — flourishing in the second and third centuries CE in the eastern Mediterranean and surviving in attenuated form in the Mandaeans of southern Iraq — in which …
Anti-Trinitarianism
Anti-Trinitarianism is the broad family of Christian and post-Christian movements that deny the orthodox doctrine of the Trinity as defined at Nicaea (325) and Constantinople (381), holding instead a strictly unitary view of God. Its …
Theosophy
Theosophy is the modern esoteric movement founded in New York in 1875 by Helena Petrovna Blavatsky and Henry Steel Olcott as the Theosophical Society, and developed in Blavatsky's great syncretic works 'Isis Unveiled' (1877) and …
Western Esotericism
'Western esotericism' is both a historical current and the modern academic field that studies it. As a current it embraces Renaissance Hermeticism (Marsilio Ficino's Latin translation of the 'Corpus Hermeticum', 1471), Christian Kabbalah (Giovanni Pico …
Newtonianism
Newtonianism is the eighteenth-century worldview that took Isaac Newton's 'Philosophiae Naturalis Principia Mathematica' (1687) and 'Opticks' (1704) as the paradigm of all rigorous natural knowledge and extended their assumptions — absolute space and time, universal …
Classical Political Economy
Classical political economy is the tradition of economic analysis that began with the Scottish Enlightenment and dominated economic thought from the late eighteenth century to about 1870, when the marginalist revolution displaced it. Its foundational …
Social Democracy
Social Democracy is the reformist socialist tradition that seeks to achieve the substantive goals of socialism — economic justice, decommodified social provision, the dignity of labour — through democratic constitutional means rather than revolutionary rupture. …
Social Contract Theory
Social Contract theory holds that the legitimacy of political authority — and of the moral rules enforced by it — derives from the consent, actual or hypothetical, of those subject to it. Thomas Hobbes's 'Leviathan' …
Marxism
Marxism is the comprehensive social, economic, and political tradition founded by Karl Marx and Friedrich Engels that takes the mode of production — the historically specific way human beings collectively organise the production and reproduction …
Effective Altruism
Effective Altruism is the philosophical and practical movement that seeks to use evidence and careful reasoning to do the most good possible with one's resources, treating beneficence as a quantitative problem of maximisation under constraint. …
Mahayana Buddhism
Mahāyāna Buddhism — the 'Great Vehicle' — is the broad movement within Buddhism, emerging in India between roughly 100 BCE and 100 CE, that reframes the Buddhist path around the bodhisattva ideal: the aspirant vows …
Theravada Buddhism
Theravāda Buddhism — the 'Way of the Elders' — is the surviving school of early Indian Buddhism, preserved through the Pāli Canon (Tipiṭaka) and the unbroken monastic lineage of the Sri Lankan and Southeast Asian …
Zen Buddhism
Zen Buddhism — Chan in Chinese, Sŏn in Korean, Thiền in Vietnamese — is the meditative tradition within East Asian Mahāyāna that emphasises direct, unmediated experience of one's own buddha-nature, transmitted from teacher to student …
Madhyamaka
Madhyamaka — the 'Middle Way' school — is the Mahāyāna philosophical tradition founded by Nāgārjuna (c. 150-250 CE) that argues for the universal emptiness of intrinsic existence (svabhāva-śūnyatā): nothing whatsoever — not the self, not …
Vedanta
Vedānta — 'the end of the Vedas' — is the broad family of Hindu philosophical and theological traditions that take as their canonical sources the Upaniṣads (the speculative texts that conclude the Vedic corpus, composed …
Cynicism
Cynicism is the radical ancient Greek philosophical movement that identifies virtue as the sole good and rejects wealth, convention, and social prestige as worthless distractions from the life according to nature. Antisthenes (c. 445–365 BCE), …
Academic Scepticism
Academic Scepticism is the tradition of systematic doubt that developed within Plato's Academy during the Hellenistic period, holding that certain knowledge is unattainable but that rational action can be guided by probable impressions (to pithanon). …
Middle Platonism
Middle Platonism is the phase of the Platonic tradition extending from roughly 80 BCE to 250 CE, during which the Academy's inheritance was synthesised with Aristotelian, Stoic, and Pythagorean elements and recast in increasingly theological …
Sophism
The Sophists were itinerant teachers of rhetoric, argumentation, and political skill who flourished in fifth-century BCE Athens, offering a revolutionary challenge to traditional Greek assumptions about truth, morality, and knowledge. Protagoras of Abdera (c. 490–420 …
Cyrenaicism
Cyrenaicism is the hedonist philosophical school founded by Aristippus of Cyrene (c. 435–356 BCE), a student of Socrates, which holds that present bodily pleasure (hedone) is the sole intrinsic good and present bodily pain the …
Milesian School
The Milesian School is the earliest identifiable tradition of Western philosophy and natural science, originating in the Ionian city of Miletus in the sixth century BCE. Its defining question — what is the arche, the …
Cappadocian Theology
Cappadocian Theology is the fourth-century theological movement led by Basil of Caesarea (c. 330–379), Gregory of Nyssa (c. 335–395), and Gregory of Nazianzus (c. 329–390), which gave definitive shape to Trinitarian orthodoxy and laid the …
Egyptian Wisdom (Ma'at Tradition)
Egyptian wisdom literature constitutes the oldest surviving body of sustained ethical reflection, centred on ma'at — the cosmic principle of truth, justice, order, and right action that the creator god established at the foundation of …
Mesopotamian Wisdom
Mesopotamian wisdom encompasses the literary, legal, and theological traditions of ancient Sumer, Akkad, Babylon, and Assyria — the earliest civilisational complex to develop writing, codified law, and sustained literary reflection on the human condition. The …
Vedic Tradition
The Vedic tradition is the ritual-cosmological religion of the Indo-Aryan peoples as preserved in the four Vedas — the Rig Veda (c. 1500–1200 BCE), the Sama Veda, the Yajur Veda, and the Atharva Veda — …
Hebrew Prophecy
Hebrew prophecy is the tradition of divinely commissioned speech in ancient Israel — the nabi (prophet) who is called, often against personal inclination, to deliver God's word to the people, the king, and the nations. …
Israelite Wisdom
Israelite wisdom (chokmah) is the sapiential tradition of ancient Israel — a body of literature that reflects on the moral order, the human condition, and the fear of the LORD as the foundation of right …
Zhou Ritual Tradition
The Zhou ritual tradition is the political-cosmological order of the Western and early Eastern Zhou dynasty (c. 1046–771 BCE and following) — the system of ritual propriety (li), the Mandate of Heaven (tianming), and the …