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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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This question we cannot be long in deciding, For besides all the other arguments, with which this subject abounds, it must evidently appear, that the relation of ideas, which experience shews to be so requisite a circumstance to the production of the passion, would be entirely superfluous, were it not to second a relation of affections, and facilitate the transition from one impression to another. If we leave this ground of experience, they become mere fictions of thought, the possibility of which is quite indemonstrable; and they cannot, consequently, be employed as hypotheses in the explanation of real phenomena. Now as we cannot cognize completely a priori the existence of any object of sense, though we can do so comparatively a priori, that is, relatively to some other previously given existence--a cognition, however, which can only be of such an existence as must be contained in the complex of experience, of which the previously given perception is a part--the necessity of existence can never be cognized from conceptions, but always, on the contrary, from its connection with that which is an object of perception. In experimental philosophy, doubt and delay may be very useful; but no misunderstanding is possible, which cannot be easily removed; and in experience means of solving the difficulty and putting an end to the dissension must at last be found, whether sooner or later. For to except even a single phenomenon from its operation is to exclude it from the sphere of possible experience and thus to admit it to be a mere fiction of thought or phantom of the brain. But, to attribute to substances in the world itself such a faculty, is quite inadmissible; for, in this case; the connection of phenomena reciprocally determining and determined according to general laws, which is termed nature, and along with it the criteria of empirical truth, which enable us to distinguish experience from mere visionary dreaming, would almost entirely disappear.