Full Idea
With respect to moral laws, experience is (alas!) the mother of illusion, and it is most reprehensible to derive the laws concerning what I ought to do from what is done, or to want to limit it to that.
Gist of Idea
We cannot derive moral laws from experience, as it is the mother of illusion
Source
Immanuel Kant (Critique of Pure Reason [1781], B375/A319)
Book Reference
Kant,Immanuel: 'Critique of Pure Reason', ed/tr. Guyer,P /Wood,A W [CUO 1998], p.398
A Reaction
Kant agrees with Hume, and turns to a non-naturalistic and cognitivist explanation, whereas Hume turns to a non-cognitivist naturalistic one (based on human feelings). Aristotle's view is somewhat based on the experience of human nature.