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Extrait de THE CRITIQUE OF PURE REASON

But, when no proper employment of a faculty of cognition is possible, no canon can exist.
But the synthetical cognition of pure speculative reason is, as has been shown, completely impossible.
There cannot, therefore, exist any canon for the speculative exercise of this faculty--for its speculative exercise is entirely dialectical; and, consequently, transcendental logic, in this respect, is merely a discipline, and not a canon.
If, then, there is any proper mode of employing the faculty of pure reason--in which case there must be a canon for this faculty--this canon will relate, not to the speculative, but to the practical use of reason.
This canon we now proceed to investigate.
SECTION I. Of the Ultimate End of the Pure Use of Reason.
There exists in the faculty of reason a natural desire to venture beyond the field of experience, to attempt to reach the utmost bounds of all cognition by the help of ideas alone, and not to rest satisfied until it has fulfilled its course and raised the sum of its cognitions into a self-subsistent systematic whole.
Is the motive for this endeavour to be found in its speculative, or in its practical interests alone?
Setting aside, at present, the results of the labours of pure reason in its speculative exercise, I shall merely inquire regarding the problems the solution of which forms its ultimate aim, whether reached or not, and in relation to which all other aims are but partial and intermediate.
These highest aims must, from the nature of reason, possess complete unity; otherwise the highest interest of humanity could not be successfully promoted.
The transcendental speculation of reason relates to three things; the freedom of the will, the immortality of the soul, and the existence of God.
The speculative interest which reason has in those questions is very small; and, for its sake alone, we should not undertake the labour of transcendental investigation--a labour full of toil and ceaseless struggle.
We should be loth to undertake this labour, because the discoveries we might make would not be of the smallest use in the sphere of concrete or physical investigation.
We may find out that the will is free, but this knowledge only relates to the intelligible cause of our volition.
As regards the phenomena or expressions of this will, that is, our actions, we are bound, in obedience to an inviolable maxim, without which reason cannot be employed in the sphere of experience, to explain these in the same way as we explain all the other phenomena of nature, that is to say, according to its unchangeable laws.
We may have discovered the spirituality and immortality of the soul, but we cannot employ this knowledge to explain the phenomena of this life, nor the peculiar nature of the future, because our conception of an incorporeal nature is purely negative and does not add anything to our knowledge, and the only inferences to be drawn from it are purely fictitious.
If, again, we prove the existence of a supreme intelligence, we should be able from it to make the conformity to aims existing in the arrangement of the world comprehensible; but we should not be justified in deducing from it any particular arrangement or disposition, or inferring any where it is not perceived.
For it is a necessary rule of the speculative use of reason that we must not overlook natural causes, or refuse to listen to the teaching of experience, for the sake of deducing what we know and perceive from something that transcends all our knowledge.
In one word, these three propositions are, for the speculative reason, always transcendent, and cannot be employed as immanent principles in relation to the objects of experience; they are, consequently, of no use to us in this sphere, being but the valueless results of the severe but unprofitable efforts of reason.
If, then, the actual cognition of these three cardinal propositions is perfectly useless, while Reason uses her utmost endeavours to induce us to admit them, it is plain that their real value and importance relate to our practical, and not to our speculative interest.
I term all that is possible through free will, practical.