The Principle of the Anticipations
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In the Third Analogy Kant maintains that if the objects perceived coexist, the subjective succession must be reversible; and if the subjective succession is reversible, then the objects perceived must coexist. None of these statements has any meaning except on the assumption that what we perceive is an object or permanent substance; but if we accept this assumption, together with the view that a permanent substance is not a thing-in-itself. Kant's problem in the Second and Third Analogies is to determine the conditions under which our experience of succession and coexistence in the states of permanent substances can be valid, it being assumed throughout that such permanent substances are not things-in-themselves. What we have seen is that in experience of objective coexistence we assume the reciprocal succession of our sense-perceptions to be grounded on the coexistent objects, and only so can we have knowledge of such objects.