This is the proper place to explain the paradox of method in a
critique of practical reason, namely, that the concept of good and
evil must not be before the moral law (of which it seems as
if it must be the foundation), but only after it and by means of it.
critique of practical reason, namely, that the concept of good and
evil must not be before the moral law (of which it seems as
if it must be the foundation), but only after it and by means of it.
Kant - Critique of Practical Reason