But this last is quite possible if time is nothing but the subjective condition under which alone intuition can take place in us. For that being so, this form of inner intuition can be represented prior to the objects, and therefore a priori. Time is nothing but the form of inner sense, that is, of intuition of ourselves and of our inner state. And just because this inner intuition yields no shape, we endeavor to make up for this want by analogies. From this fact also, that all the relations of time allow of being expressed in an outer intuition, it is evident that the representation is itself an intuition.
Time is the formal a priori condition of all appearances whatsoever.
Just as I can say a priori that all outer appearances are in space, and are determined a priori in conformity with the relations of space, I can also say, from the principle of inner sense, that all appearances whatsoever, that is, all objects of the senses, are in time, and necessarily stand in time-relations. It has objective validity only in respect of appearances, these being things which we take as objects of our senses. It is no longer objective, if we abstract from the sensibility of our intuition, that is, from that mode of representation which is peculiar to us, and speak of things in general. Nevertheless, in respect of all appearances, and therefore of all the things which can enter into experience, it is necessarily objective. We cannot say that all things are in time, because in this concept of things in general we are abstracting from every mode of their intuition and therefore from that condition under which alone objects can be represented as being in time.