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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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All the powers of reason, in the sphere of what may be termed pure philosophy, are, in fact, directed to the three above-mentioned problems alone. Now, as in the merely speculative employment of reason the latter is properly the sole aim, and as in this case the approximation to a conception, which is never attained in practice, is the same thing as if the conception were non-existent--it is commonly said of the conception of this kind, "it is only an idea." So we might very well say, "the absolute totality of all phenomena is only an idea," for, as we never can present an adequate representation of it, it remains for us a problem incapable of solution. She has thus fortified reason against all affirmations of the contrary. From this it follows, that though the conformity betwixt love and hatred in the agreeableness of their sensation makes them always be excited by the same objects, yet this other contrariety is the reason, why they are excited in very different degrees.
Now this would be perfectly admissible in every sort of reasoning, from a consequence to its principle; but in the present case it unfortunately happens that the condition of absolute necessity can be discovered in but a single being, the conception of which must consequently contain all that is requisite for demonstrating the presence of absolute necessity, and thus entitle me to infer this absolute necessity a priorI. That is, it must be possible to reason conversely, and say; The thing, to which the conception of the highest reality belongs, is absolutely necessary. - In a system of pure reason, definitions of them would be with justice demanded of me, but to give them here would only bide from our view the main aim of our investigation, at the same time raising doubts and objections, the consideration of which, without injustice to our main purpose, may be very well postponed till another opportunity.
But it cannot be said of reason, that the state in which it determines the will is always preceded by some other state determining it. The most remarkable circumstance connected with these principles is that they seem to be transcendental, and, although only containing ideas for the guidance of the empirical exercise of reason, and although this empirical employment stands to these ideas in an asymptotic relation alone (to use a mathematical term), that is, continually approximate, without ever being able to attain to them, they possess, notwithstanding, as a priori synthetical propositions, objective though undetermined validity, and are available as rules for possible experience.