The opposing schools of philosophers annihilated each other, and the result was scepticism. Knowledge is the product of their mutual co-operation. Mind does not originate ideas, neither does sensation impart them. Object and subject, sterile by themselves, become fruitful by conjunction. There are not two sources of knowledge, but one only, and that one is produced by the union of the two apparent opposites.
Truth is the crystallization, so to speak, that results from the combined elements.
Let us follow the initial steps of Kant's analysis. The first fact noted is, that the subject is sensitive to impressions made by outward things, and is receptive of them. Time is no empirical conception which can be deduced from experience. Time is a necessary representation which lies at the foundation of all intuitions. In it alone is any reality of phenomena possible.