The Critique of Pure Reason revolutionized our relationship to knowledge. The Introduction from 1787 reproduced in the present edition is the royal road to enter this cathedral work. The text offers a powerful definition of the overall objective of Critique: to trace the boundaries of human knowledge. But the stakes are even greater. It is a question of determining the destiny of metaphysics, whether to place it back on the safe path of science, or to make the requiem of the now fallen “queen of sciences” resonate. The Introduction does not presuppose any prior reading of a Kantian work in order to be understood. Starting to read Kant from such a starting point is the promise of a new perspective. By proceeding step by step and defining each key concept, this methodical text unfolds before our eyes what we could call the Kantian order of reasons.