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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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It is plain that, if all causality in the world of sense were natural--and natural only--every event would be determined by another according to necessary laws, and that, consequently, phenomena, in so far as they determine the will, must necessitate every action as a natural effect from themselves; and thus all practical freedom would fall to the ground with the transcendental idea.

 But here it is remarkable, that though a positive law can only derive its force from these principles, yet it acquires not all the force of the principle from whence it is derived, but loses considerably in the transition; as it is natural to imagine. as the original ground of her necessary conformability to law (as natura formaliter spectata). The proposition therefore--if all causality is possible only in accordance with the laws of nature--is, when stated in this unlimited and general manner, self-contradictory. It is not, however, a constitutive principle, determining an object to which it directly relates; it is merely a regulative principle or maxim, advancing and strengthening the empirical exercise of reason, by the opening up of new paths of which the understanding is ignorant, while it never conflicts with the laws of its exercise in the sphere of experience.