Critique of Pure Reason

Main ideas

• Knowledge requires both sensibility and the categories of understanding.
• Metaphysical overreach produces unavoidable illusion.

Important themes

Reading context

Kant's answer to Hume, published in 1781 and rewritten in 1787. If experience is shaped by the mind's own structures, we can explain why mathematics and physics hold, and why metaphysics keeps overreaching.

How to approach it

Read the prefaces and the introduction, then the Transcendental Aesthetic, with a guide alongside. Almost nobody reads this book straight through unaided, and there is no shame in that.