On Conjectures
De Coniecturis — Cusa's c. 1442-43 sequel to De Docta Ignorantia, on the doctrine that all finite knowledge is "conjectural" approximation to truth
Tradition: Late medieval / Renaissance Christian Platonism / epistemology
All finite knowledge is conjecture — approximation to a truth never fully attained — and recognising this is itself the condition of progress
De Coniecturis is Cusa's c. 1442-43 systematic development of the epistemological side of De Docta Ignorantia. Its thesis: all finite knowledge is "conjecture" (coniectura) — a positive approximation toward truth that the finite intellect, working from its own contracted perspective, can never fully attain but can always more closely approach. The book lays out a fourfold "universe of intelligence" — divine, intellectual, rational, sensible — and shows how each level forms its conjectures appropriate to its mode of contraction. Book I treats the metaphysical framework of conjectural knowing; Book II applies it to specific topics including the conjectural sciences of the soul, the body, time, virtue, and prayer. The work is foundational for what would become the modern philosophical recognition that scientific knowledge is fallible-progressive rather than absolute — Cusa's "conjecture" is the conceptual ancestor of Popper's "conjecture and refutation" — and remains one of the most underappreciated works of late-medieval epistemology.
Editions cited
- De Coniecturis (composed c. 1442-43); modern critical edition Josef Koch, Karl Bormann in Opera Omnia Cusana III (Felix Meiner, 1972); English trans. Jasper Hopkins, On Surmises (Banning, 2000)
School Embodiments
The fourfold structure of intellectual levels (divine, intellectual, rational, sensible) is Neoplatonic in inheritance — Plotinus's and Proclus's hierarchies adapted to Cusa's Christian framework.
"There are four modes of unity in the universe of intelligences: divine, intellectual, rational, sensible; and corresponding to these are four modes of conjecture by which the finite mind approaches the absolute." (De Coniecturis I.4)
The doctrine that all finite knowledge is conjectural approximation to a real truth is paradigmatically critical-realist: the truth is real and mind-independent, our access to it is mediated and progressive.
"Conjecture is a positive assertion partaking of truth as it is in itself, but participating in it by alterity. The truth that is unattainable by precise knowledge is therefore conjecturally apprehended." (De Coniecturis I.11)
The Platonic tradition — the divided line, the participation framework, the gradation of intelligibles — is the architectural background of the four-level scheme.
"As Plato divided his line into segments corresponding to four kinds of knowing, so we distinguish four levels of conjectural cognition." (De Coniecturis I.5)
The role of the knowing intellect in constituting its conjectures, while the absolute truth remains unattainable in itself, anticipates the post-Kantian idealist epistemology.
"The mind, by its own light, forms conjectures of what otherwise it could not know; conjecture is the mind's own activity, and yet it reaches toward what is not the mind." (De Coniecturis I.2)
The thesis that finite knowledge is progressive-conjectural rather than absolute makes Cusa a forerunner of modern philosophy-of-science fallibilism (Popper explicitly cited Cusa).
"Each conjecture is better or worse than another, and the work of intelligence is to refine its conjectures by continual return to the things themselves." (De Coniecturis I.13)
Despite the apophatic limits, Cusa retains a strong rationalist confidence: the conjectural method, properly applied, does make progress toward truth — it is the right method, not a counsel of despair.
"To say that all our knowledge is conjecture is not to say that no knowledge is possible, but to specify the manner in which finite knowledge is possible." (De Coniecturis II.1)
Cusa writes within Catholic intellectual culture; the conjectural framework is meant as a deepening, not a refutation, of the scholastic tradition.
"What the schoolmen call demonstration is itself a conjecture in the sense I here define; the language differs but the work of intelligence is the same." (De Coniecturis I.9)
Christian-mystical tradition.
Internal Tensions
De Coniecturis was less widely read than De Docta Ignorantia and the fact has somewhat masked its philosophical originality. Hopkins, Miller, and Cassirer have argued for its anticipation of modern philosophy of science; Catholic-traditional readings (Gilson, Maritain) sometimes treat it as too sceptical for the orthodox-realist framework. The relation between conjecture and the dogmatic content of Catholic faith — which Cusa does not treat as merely conjectural — has been debated for five centuries; Cusa's defense is that revelation is not finite knowledge but God's own self-disclosure.
I. Time
The temporal progress of conjectural knowing — each generation refines what previous generations conjectured, never finally attaining absolute truth.
Attributes
II. Space
The four-level structure of intellectual reality — divine, intellectual, rational, sensible — as the framework within which any conjecture is formed.
Attributes
III. Matter
The created material world as the lowest level of contracted being, knowable conjecturally through the sensible mode.
Attributes
IV. Observer
The finite intellect whose conjectures are the mode of finite knowing — neither absolute nor empty, but progressive approximation.
Attributes
V. Energy
The cognitive energies of the intellect that form and refine conjectures; the dynamic of approximation toward the absolute.
Attributes
VI. Information
The conjectural content of finite knowledge — discrete propositions that approximate, but never coincide with, the absolute truth they aim at.
Attributes
Personas with the nearest attribute fingerprint
Historical figures whose own classification on the same six-dimensional grid lands closest to this work's. Computed by attribute-agreement on coordinates both address.
Computed school proximity
The work's attribute fingerprint scored against all schools using the same quiz scorer. Useful as a sanity check on the hand-curated embodiments above.
How On Conjectures resolves each dilemma
50 resolved positions across 4 dimensions, including 19 distinctive where the majority of schools go the other way · 7 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.
6 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.