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Cliquer sur les phrases pour les voir dans leur contexte. Les textes de Immanuel Kant et David Hume sont disponibles auprès du Projet Gutenberg.

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Transcendental theology aims either at inferring the existence of a Supreme Being from a general experience, without any closer reference to the world to which this experience belongs, and in this case it is called cosmotheology; or it endeavours to cognize the existence of such a being, through mere conceptions, without the aid of experience, and is then termed ontotheology.

 We are actually in possession of a priori synthetical cognitions, as is proved by the existence of the principles of the understanding, which anticipate experience. It assumed that the only immediate experience is internal and that from this we can only infer the existence of external things. But reason cannot cogitate this systematic unity, without at the same time cogitating an object of the idea--an object that cannot be presented in any experience, which contains no concrete example of a complete systematic unity. 
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.
 The very essence of an idea consists in the fact that no experience can ever be discovered congruent or adequate with it. Whenever I hear someone complain about the cost of cartridges, I always refer them to you.  On the contrary, reason, in its uninterrupted progress in the empirical synthesis, is necessarily conducted to them, when it endeavours to free from all conditions and to comprehend in its unconditioned totality that which can only be determined conditionally in accordance with the laws of experience. But it having been already proved, that the power lies not in the sensible qualities of the cause; and there being nothing but the sensible qualities present to us; I ask, why in other instances you presume that the same power still exists, merely upon the appearance of these qualities? Your appeal to past experience decides nothing in the present case; and at the utmost can only prove, that that very object, which produced any other, was at that very instant endowed with such a power; but can never prove, that the same power must continue in the same object or collection of sensible qualities; much less, that a like power is always conjoined with like sensible qualities. The proposition; "Caius is mortal," is one which may be obtained from experience by the aid of the understanding alone; but my wish is to find a conception which contains the condition under which the predicate of this judgement is given--in this case, the conception of man--and after subsuming under this condition, taken in its whole extent (all men are mortal), I determine according to it the cognition of the object thought, and say; "Caius is mortal." This law of specification cannot be deduced from experience; it can never present us with a principle of so universal an application.