The Critique of Pure Reason, Part 42 summary

What happens

1. The account distinguishes understanding, which supplies rules, from reason, which unifies those rules under principles.
2. It separates principles grounded in conceptions alone from general propositions that depend on intuition or possible experience.
3. The discussion of syllogisms shows how reason brings particular cognitions under general conditions to increase unity.
4. The pure use of reason raises the question whether arranging cognitions also warrants claims about objects.
5. Reason seeks the unconditioned, but treating an entire chain of conditions as given requires a synthetic principle.
6. Transcendental dialectic receives the task of testing this principle and examining the errors associated with it.

What to notice

The distinction shows why reason cannot reach the unconditioned merely by analyzing conditioned cognition. A claim that the complete series is given requires a synthetic principle whose validity needs examination.

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