The things we do!

{BOOK_1|CHAPTER_1 ^paragraph 10}
REMARK.

Supposing that pure reason contains in itself a practical motive,
that is, one adequate to determine the will, then there are
practical laws; otherwise all practical principles will be mere
maxims. In case the will of a rational being is pathologically
affected, there may occur a conflict of the maxims with the
practical laws recognized by itself. For example, one may make it
his maxim to let no injury pass unrevenged, and yet he may see that
this is not a practical law, but only his own maxim; that, on the
contrary, regarded as being in one and the same maxim a rule for the
will of every rational being, it must contradict itself. In natural
philosophy the principles of what happens, e.g., the principle of
equality of action and reaction in the communication of motion) are at
the same time laws of nature; for the use of reason there is
theoretical and determined by the nature of the object. In practical
philosophy, i.


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