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The Critique of Pure Reason, Part 4, Section III summary

Part 4, Section III of 79 · Part 2: Transcendental Logic · 5 min to read the section

In Section III, the argument divides transcendental ideas into three classes concerning the thinking subject, the conditions of appearances, and the highest condition of everything conceivable. It distinguishes these products of pure reason from concepts of the understanding, explains their ascent toward the unconditioned, and connects them into a single system.

What happens

  1. The argument distinguishes transcendental dialectic from logical dialectic and identifies reason’s aim as reaching the unconditioned.
  2. Three relations among representations establish three classes of transcendental ideas: subject, conditions of appearances, and all things.
  3. These classes ground rational psychology, rational cosmology, and transcendental theology as problems of pure reason.
  4. The ideas arise from reason’s forms of inference, but cannot receive an objective deduction through experience.
  5. Reason seeks complete conditions, not complete consequences, so a total series of future changes is only an arbitrary thought.
  6. The ideas form a connected system progressing from self to world to supreme being.

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Why is an objective deduction of transcendental ideas impossible?

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