Critique of Pure Reason
Kritik der reinen Vernunft — the first Critique, in two editions (A 1781, B 1787)
Tradition: Modern German philosophy / transcendental idealism
The "Copernican revolution" — the conditions of any possible experience are supplied by the mind, not by things in themselves
The first Critique is the founding text of modern German philosophy and one of the most ambitious works of philosophy ever written. Kant's programme: to determine the scope and limits of theoretical reason by examining the conditions of possible experience. The Transcendental Aesthetic argues that space and time are pure forms of intuition supplied by the mind; the Transcendental Analytic argues that the categories of the understanding (substance, causality, etc.) are likewise supplied a priori; the Transcendental Dialectic shows that reason inevitably overreaches into illusion when it tries to apply these categories beyond possible experience — to God, soul, freedom, the world as a totality. The result is the Copernican revolution: knowledge depends on the structure of the knower, not on things-in-themselves, which remain unknowable. Every later philosophy — Hegel, Marx, Husserl, analytic philosophy, contemporary debates over realism — positions itself relative to Kant.
Author
Editions cited
- Critique of Pure Reason (Paul Guyer & Allen Wood, Cambridge, 1998)
- Critique of Pure Reason (Norman Kemp Smith, Macmillan, 1929 — still in print)
- Critique of Pure Reason (Werner Pluhar, Hackett, 1996, abridged 1999)
School Embodiments
The first Critique is *the* foundational text of transcendental idealism. Every Kantian and Neo-Kantian programme since positions itself relative to this work.
"Thoughts without content are empty; intuitions without concepts are blind." (CPR A51/B75)
Kant's claim that space, time, and the categories are mind-supplied is the starting point of the German Idealist tradition (Fichte, Schelling, Hegel), even though each later figure rejected Kant's things-in-themselves.
"The order and regularity in the appearances which we entitle nature, we ourselves introduce." (CPR A125)
Kant was raised on Wolffian rationalism and aims to rescue what is defensible in it — the a priori, the necessity of mathematics and physics — against the Humean challenge.
"I had to deny knowledge in order to make room for faith." (CPR B xxx, second-edition preface)
Kant repeatedly credits Hume with awakening him from dogmatic slumber; the Critique's entire structure is an attempt to ground synthetic a priori knowledge against the Humean argument that no such knowledge is possible.
"All our knowledge begins with experience, but not all of it arises from experience." (CPR B1, opening of the second-edition introduction)
Husserl, Heidegger, and the phenomenological tradition read the Critique as the first systematic analysis of the structures of experience — the prehistory of phenomenology proper.
"The conditions of the possibility of experience in general are at the same time conditions of the possibility of the objects of experience." (CPR A158/B197)
Internal Tensions
Things-in-themselves haunt the Critique. Are they a coherent limit-concept, or do they apply the category of causality illegitimately (in saying that they "cause" appearances)? Hegel's critique on this point set the agenda for German Idealism. The other classic tension: the two editions (A and B) disagree on the unity of consciousness and on the Refutation of Idealism. Most modern editions print both.
I. Time
Kant's most radical claim: time is a pure form of intuition, a contribution of the mind to experience rather than a feature of things in themselves. "Time is nothing other than the form of inner sense" (CPR A33/B49). Time is therefore "empirically real and transcendentally ideal" — it structures all experience, but does not apply to things as they are independent of mind. Time Ontological Status is Emergent in this precise transcendental-idealist sense.
Attributes
II. Space
Parallel argument: space is a pure form of outer intuition. "Space is not an empirical concept... it is rather a pure intuition" (CPR A24/B39). Newton's absolute space and Leibniz's relational space are both rejected as accounts of things-in-themselves; both can be salvaged as accounts of the empirically real spatial framework of human experience.
Attributes
III. Matter
Matter is appearance, structured by the categories of understanding. The Refutation of Idealism (B274–9) argues that the existence of objects outside us is the condition of consistent self-consciousness; matter is not in our heads, but it is also not knowable as it is in itself.
Attributes
IV. Observer
The Kantian observer is plural at the empirical level (individual persons), singular at the transcendental level (the "I think" that must accompany all my representations), embodied in experience, and split between phenomenal determinism and noumenal freedom — the great moral problem the second Critique addresses. The metaphysical agency is personal in regulative use (God as a postulate of practical reason) but not in constitutive use.
Attributes
V. Energy
Kant's pre-critical Metaphysical Foundations of Natural Science (1786) treats matter as composed of attractive and repulsive forces; energy in the modern sense is not yet thematised. The first Critique implies a substantival physics within phenomena, in which conservation principles (matter, force) operate.
Attributes
VI. Information
The categories supply the formal-informational structure of all possible experience. This is relational information in a strong sense — the categories are not "out there" but arise in the constitution of objects. The soul's immortality is a postulate of practical reason (Critique of Practical Reason); within theoretical knowledge it cannot be proven, but the moral law requires it.
Attributes
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How Critique of Pure Reason resolves each dilemma
48 resolved positions across 4 dimensions, including 15 distinctive where the majority of schools go the other way · 9 unaligned.
Each dimension is sorted so minority positions come first. Mainstream positions are folded into an expandable list.
Time · 9 dilemmas · 3 distinctive
Persistence, the future, and the direction of becoming.
3 mainstream positions
Matter · 7 dilemmas · 5 distinctive
What stuff is — fundamental, relational, or appearance.
Observer · 37 dilemmas · 5 distinctive
Mind, agency, and the knower's relation to the known.