But the law of freedom
(that is, of a causality not subject to sensible conditions), and
consequently the concept of the unconditionally good, cannot have
any intuition, nor consequently any schema supplied to it for the
purpose of its application in concreto. Consequently the moral law has
no faculty but the understanding to aid its application to physical
objects (not the imagination); and the understanding for the
purposes of the judgement can provide for an idea of the reason, not a
schema of the sensibility, but a law, though only as to its form as
law; such a law, however, as can be exhibited in concreto in objects
of the senses, and therefore a law of nature. We can therefore call
this law the type of the moral law.
The rule of the judgement according to laws of pure practical reason
is this: ask yourself whether, if the action you propose were to
take place by a law of the system of nature of which you were yourself
a part, you could regard it as possible by your own will. Everyone
does, in fact, decide by this rule whether actions are morally good or
evil.
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