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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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In the elaboration of our experience, they may also be employed with great advantage, as heuristic [Footnote; From the Greek, eurhioko.] principles.

 If we employ our reason not merely in the application of the principles of the understanding to objects of experience, but venture with it beyond these boundaries, there arise certain sophistical propositions or theorems. It will not therefore enable us to establish any such conclusions as; "The series of conditions for a given conditioned is in itself finite." or, "It is infinite." For, in this case, we should be cogitating in the mere idea of absolute totality, an object which is not and cannot be given in experience; inasmuch as we should be attributing a reality objective and independent of the empirical synthesis, to a series of phenomena. Our general knowledge of human nature, our observation of the past history of mankind, our experience of present times; all these causes must induce us to open the door to exceptions, and must make us conclude, that we may resist the more violent effects of supreme power, without any crime or injustice. The postulate of the possibility of things requires also, that the conception of the things agree with the formal conditions of our experience in general. We may add the remark that the representation of something permanent in existence, is not the same thing as the permanent representation; for a representation may be very variable and changing--as all our representations, even that of matter, are--and yet refer to something permanent, which must, therefore, be distinct from all my representations and external to me, the existence of which is necessarily included in the determination of my own existence, and with it constitutes one experience--an experience which would not even be possible internally, if it were not also at the same time, in part, external. Even the laws of nature, if they are contemplated as principles of the empirical use of the understanding, possess also a characteristic of necessity, and we may therefore at least expect them to be determined upon grounds which are valid a priori and antecedent to all experience. Theoretical cognition is speculative when it relates to an object or certain conceptions of an object which is not given and cannot be discovered by means of experience. 

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.

 
It seems, indeed, as if the possibility of a triangle could be cognized from the conception of it alone (which is certainly independent of experience); for we can certainly give to the conception a corresponding object completely a priori, that is to say, we can construct it.