But now this synthetic unity, as the a priori condition under which I combine the manifold of an intuition in general, if I abstract from the constant form of my inner intuition, time, is the category of cause, through which, if apply it to my sensibility, I determine everything that happens in time in In such a way it is proved that the synthesis of apprehension, which is em pirical, must necessarily be in agreement with the synthesis of apperception, which is intellectual and contained in the category entirely a priori.