In our theory of the true nature of these two
original forms of the sensibility, both difficulties are surmounted.
In conclusion, that transcendental aesthetic cannot contain any more
than these two elements- space and time, is sufficiently obvious
from the fact that all other conceptions appertaining to
sensibility, even that of motion, which unites in itself both
elements, presuppose something empirical. Motion, for example,
presupposes the perception of something movable. But space
considered in itself contains nothing movable, consequently motion
must be something which is found in space only through experience-
in other words, an empirical datum. In like manner, transcendental
aesthetic cannot number the conception of change among its data a
priori; for time itself does not change, but only something which is
in time. To acquire the conception of change, therefore, the
perception of some existing object and of the succession of its
determinations, in one word, experience, is necessary.
SS 9 General Remarks on Transcendental Aesthetic.
I. In order to prevent any misunderstanding, it will be requisite,
in the first place, to recapitulate, as clearly as possible, what
our opinion is with respect to the fundamental nature of our
sensuous cognition in general.
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