No More Learning

In the order of efficient
causes we assume ourselves free, in order that in the order of ends
we may conceive ourselves as subject to moral laws: and we
afterwards conceive ourselves as subject to these laws,           we
have attributed to ourselves freedom of will: for freedom and self-
legislation of will are both autonomy, and therefore are reciprocal
conceptions, and for this very reason one must not be used to
explain the other or give the reason of it, but at most only for
logical purposes to reduce apparently different notions of the same
object to one single concept (as we reduce different fractions of
the same value to the lowest terms).