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Click on the phrases to see them in context. The original texts by Immanuel Kant and David Hume are available from the Gutenberg Projet.
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But the existence of external things is absolutely requisite for this purpose, so that it follows that internal experience is itself possible only mediately and through external experience. Reason affords no good grounds for admitting the existence of intelligible beings, or of intelligible properties of sensuous things, although--as we have no conception either of their possibility or of their impossibility--it will always be out of our power to affirm dogmatically that they do not exist. Thus this argument is utterly insufficient for the task before us--a demonstration of the existence of an all-sufficient being. It follows that in objects of perception, that is, in phenomena, there must be found a substratum which represents time in general, and in which all change or coexistence can be perceived by means of the relation of phenomena to it. For the principle of the former enounces, not that things themselves or substances, but only that which happens or their states--as empirically contingent, have a cause; the assertion that the existence of substance itself is contingent is not justified by experience, it is the assertion of a reason employing its principles in a speculative manner. The case is very different with those principles whose province it is to subject the existence of phenomena to rules a priorI. For as existence does not admit of being constructed, it is clear that they must only concern the relations of existence and be merely regulative principles. Now, as in order to cognize ourselves, in addition to the act of thinking, which subjects the manifold of every possible intuition to the unity of apperception, there is necessary a determinate mode of intuition, whereby this manifold is given; although my own existence is certainly not mere phenomenon (much less mere illusion), the determination of my existence* Can only take place conformably to the form of the internal sense, according to the particular mode in which the manifold which I conjoin is given in internal intuition, and I have therefore no knowledge of myself as I am, but merely as I appear to myself.