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On the contrary, our criticism is the necessary preparation for a thoroughly scientific system of metaphysics which must perform its task entirely a priori, to the complete satisfaction of speculative reason, and must, therefore, be treated, not popularly, but scholastically. In order to produce a perfect relation betwixt two objects, it is requisite, not only that the imagination be conveyed from one to the other by resemblance, contiguity or causation, but also that it return back from the second to the first with the same ease and facility.