All of these postulates commence from the principle of morality, which is not a postulate but a by which reason determines the will directly; and this will, precisely by being so determined, as a pure will, deman these necessary conditio of observance of its precept These postulates are not theoretical dogmas but presuppositions from a necessarily practical point of view; hence, although they do not expand theoretical cognition, they do give objective reality to the ideas of speculative reason in general (by means of their reference to the practical sphere and entitle it to concepts of which it could not otherwise presume to assert even the possibility.