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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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For it cannot be alleged that, instead of the laws of nature, laws of freedom may be introduced into the causality of the course of nature.

 The natural law that everything which happens must have a cause, that the causality of this cause, that is, the action of the cause (which cannot always have existed, but must be itself an event, for it precedes in time some effect which it has originated), must have itself a phenomenal cause, by which it is determined and, and, consequently, all events are empirically determined in an order of nature--this law, I say, which lies at the foundation of the possibility of experience, and of a connected system of phenomena or nature is a law of the understanding, from which no departure, and to which no exception, can be admitted. 
For according to the principle of causality, actions are always the first ground of all change in phenomena and, consequently, cannot be a property of a subject which itself changes, because if this were the case, other actions and another subject would be necessary to determine this change.
 In both these cases the principle of causality, which is valid only in the field of experience--useless and even meaningless beyond this region, would be diverted from its proper destination. For, while in the consideration of freedom in the former antinomy, the thing itself--the cause (substantia phaenomenon)--was regarded as belonging to the series of conditions, and only its causality to the intelligible world--we are obliged in the present case to cogitate this necessary being as purely intelligible and as existing entirely apart from the world of sense (as an ens extramundanum); for otherwise it would be subject to the phenomenal law of contingency and dependence. That everything that happens has a cause, cannot be concluded from the general conception of that which happens; on the contrary the principle of causality instructs us as to the mode of obtaining from that which happens a determinate empirical conception. We must understand, on the contrary, by the term freedom, in the cosmological sense, a faculty of the spontaneous origination of a state; the causality of which, therefore, is not subordinated to another cause determining it in time. Hence we cannot ask; "Why did not reason determine itself in a different manner?" The question ought to be thus stated; "Why did not reason employ its power of causality to determine certain phenomena in a different manner?" "But this is a question which admits of no answer.