*
*To behold virtue in her proper form is nothing else but to
contemplate morality stripped of all admixture of sensible things
and of every spurious ornament of reward or self-love. How much she
then eclipses everything else that appears charming to the affections,
every one may readily perceive with the least exertion of his
reason, if it be not wholly spoiled for abstraction.
The question then is this: "Is it a necessary law for all rational
beings that they should always judge of their actions by maxims of
which they can themselves will that they should serve as universal
laws?" If it is so, then it must be connected (altogether a priori)
with the very conception of the will of a rational being generally.
But in order to discover this connexion we must, however
reluctantly, take a step into metaphysic, although into a domain of it
which is distinct from speculative philosophy, namely, the
metaphysic of morals. In a practical philosophy, where it is not the
reasons of what happens that we have to ascertain, but the laws of
what ought to happen, even although it never does, i.e., objective
practical laws, there it is not necessary to inquire into the
reasons why anything pleases or displeases, how the pleasure of mere
sensation differs from taste, and whether the latter is distinct
from a general satisfaction of reason; on what the feeling of pleasure
or pain rests, and how from it desires and inclinations arise, and
from these again maxims by the co-operation of reason: for all this
belongs to an empirical psychology, which would constitute the
second part of physics, if we regard physics as the philosophy of
nature, so far as it is based on empirical laws.
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