For this moral law is founded on the autonomy of his
will, as a free will which by its universal laws must necessarily be
able to agree with that to which it is to submit itself.
VI. Of the Postulates of Pure Practical Reason Generally.
{BOOK_2|CHAPTER_2 ^paragraph 60}
They all proceed from the principle of morality, which is not a
postulate but a law, by which reason determines the will directly,
which will, because it is so determined as a pure will, requires these
necessary conditions of obedience to its precept. These postulates are
not theoretical dogmas but, suppositions practically necessary;
while then they do [not] extend our speculative knowledge, they give
objective reality to the ideas of speculative reason in general (by
means of their reference to what is practical), and give it a right to
concepts, the possibility even of which it could not otherwise venture
to affirm.
These postulates are those of immortality, freedom positively
considered (as the causality of a being so far as he belongs to the
intelligible world), and the existence of God.
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