The Critique of Pure Reason, Part 8, Section III summary
Part 8, Section III of 79 · Part 2: Transcendental Logic · 11 min to read the section
In Section III, the argument restricts explanatory hypotheses to possible experience and rejects appeals to unknowable causes as substitutes for natural inquiry. It then permits speculative hypotheses only as defensive replies to opposing claims, not as knowledge or belief, because neither side can establish what lies beyond experience.
What happens
- A legitimate hypothesis requires a possible object and a connection to something actually given and certain.
- Ideas of reason can guide inquiry, but transcendental hypotheses cannot explain natural phenomena or replace investigation of natural causes.
- A hypothesis must account for its proposed consequences without relying on unsupported auxiliary assumptions.
- Pure speculative reason allows hypotheses in defense against opponents, but not as grounds for dogmatic assertions.
- Invented accounts of the soul and spiritual life illustrate how a defender can challenge claims of impossibility without asserting truth.
- The argument confines these defenses to answering objections and warns against treating them as independently valid judgments.
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When are hypotheses admissible within pure speculative reason?
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