The Critique of Pure Reason

metaphysical when it contains

that which represents the conception as given a priori

, are they merely relations or determinations of things, such, however, as would equally belong to these things in themselves, though they should never become objects of intuition; or, are they such as belong only to the form of intuition

namely, space and time

mere form of phenomena, which is all that the sensibility can afford a priori

are two pure forms of sensuous intuition

the next place we shall take away from this intu

intuition all that belongs to sensation, so that nothing may remain but pure intuition

I call all representations pure, in the transcendental meaning of the word, wherein nothing is met with that belongs to sensation.

the form must lie ready a priori for them in the mind, and consequently can be regarded separately from all sensation.