If, therefore, space (and time also) were
not a mere form of your intuition, which contains conditions a priori,
under which alone things can become external objects for you, and
without which subjective conditions the objects are in themselves
nothing, you could not construct any synthetical proposition
whatsoever regarding external objects. It is therefore not merely
possible or probable, but indubitably certain, that space and time, as
the necessary conditions of all our external and internal
experience, are merely subjective conditions of all our intuitions, in
relation to which all objects are therefore mere phenomena, and not
things in themselves, presented to us in this particular manner. And
for this reason, in respect to the form of phenomena, much may be said
a priori, whilst of the thing in itself, which may lie at the
foundation of these phenomena, it is impossible to say anything.
II. In confirmation of this theory of the ideality of the external
as well as internal sense, consequently of all objects of sense, as
mere phenomena, we may especially remark that all in our cognition
that belongs to intuition contains nothing more than mere relations.
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