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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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We cannot even cogitate time, unless, in drawing a straight line (which is to serve as the external figurative representation of time), we fix our attention on the act of the synthesis of the manifold, whereby we determine successively the internal sense, and thus attend also to the succession of this determination.

 There is no condition--determining man and his volition in conformity with this character--which does not itself form part of the series of effects in nature, and is subject to their law--the law according to which an empirically undetermined cause of an event in time cannot exist. This is that an event cannot be determined in time, and consequently cannot form a part of experience, unless it stands under this dynamical law. But in a void time the origination of a thing is impossible; because no part of any such time contains a distinctive condition of being, in preference to that of non-being (whether the supposed thing originate of itself, or by means of some other cause). For exampkle, I may compute the light of the sun, and say that its quantity is a certain number of times greater than that of the moon. We must now consider three phaenomena, which seem to be, in a manner, the reverse of these: Why a very great distance encreases our esteem and admiration for an object; Why such a distance in time encreases it more than that in space: And a distance in past time more than that in future. In the earliest times of which history affords us any record, mathematics had already entered on the sure course of science, among that wonderful nation, the Greeks.