Front Page Titles (by Subject) IX.: OF THE CONNEXION OF THE LEGISLATION OF UNDERSTANDING WITH THAT OF REASON BY MEANS OF THE JUDGEMENT - The Critique of Judgement
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IX.: OF THE CONNEXION OF THE LEGISLATION OF UNDERSTANDING WITH THAT OF REASON BY MEANS OF THE JUDGEMENT - Immanuel Kant, The Critique of Judgement 
Kant’s Critique of Judgement, translated with Introduction and Notes by J.H. Bernard (2nd ed. revised) (London: Macmillan, 1914).
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OF THE CONNEXION OF THE LEGISLATION OF UNDERSTANDING WITH THAT OF REASON BY MEANS OF THE JUDGEMENT
The Understanding legislates a priori for nature as an Object of sense—for a theoretical knowledge of it in a possible experience. Reason legislates a priori for freedom and its peculiar casuality; as the supersensible in the subject, for an unconditioned practical knowledge. The realm of the natural concept under the one legislation and that of the concept of freedom under the other are entirely removed from all mutual influence which they might have on one another (each according to its fundamental laws) by the great gulf that separates the supersensible from phenomena. The concept of freedom determines nothing in respect of the theoretical cognition of nature; and the natural concept determines nothing in respect of the practical laws of freedom. So far then it is not possible to throw a bridge from the one realm to the other. But although the determining grounds of causality according to the concept of freedom (and the practical rules which it contains) are not resident in nature, and the sensible cannot determine the supersensible in the subject, yet this is possible conversely (not, to be sure, in respect of the cognition of nature, but as regards the effects of the supersensible upon the sensible). This in fact is involved in the concept of a causality through freedom, the effect of which is to take place in the world according to its formal laws. The word cause, of course, when used of the supersensible only signifies the ground which determines the causality of natural things to an effect in accordance with their proper natural laws, although harmoniously with the formal principle of the laws of Reason. Although the possibility of this cannot be comprehended, yet the objection of a contradiction alleged to be found in it can be sufficiently answered.1 — The effect in accordance with the concept of freedom is the final purpose which (or its phenomenon in the world of sense) ought to exist; and the condition of the possibility of this is presupposed in nature (in the nature of the subject as a sensible being, that is, as man). The Judgement presupposes this a priori and without reference to the practical; and thus furnishes the mediating concept between the concepts of nature and that of freedom. It makes possible the transition from the conformity to law in accordance with the former to the final purpose in accordance with the latter, and this by the concept of a purposiveness of nature. For thus is cognised the possibility of the final purpose which alone can be actualised in nature in harmony with its laws.
The Understanding by the possibility of its a priori laws for nature, gives a proof that nature is only cognised by us as phenomenon; and implies at the same time that it has a supersensible substrate, though it leaves this quite undetermined. The Judgement by its a priori principle for the judging of nature according to its possible particular laws, makes the supersensible substrate (both in us and without us) determinable by means of the intellectual faculty. But the Reason by its practical a priori law determines it; and thus the Judgement makes possible the transition from the realm of the concept of nature to that of the concept of freedom.
As regards the faculties of the soul in general, in their higher aspect, as containing an autonomy; the Understanding is that which contains the constitutive principles a priori for the cognitive faculty (the theoretical cognition of nature). For the feeling of pleasure and pain there is the Judgement, independently of concepts and sensations which relate to the determination of the faculty of desire and can thus be immediately practical. For the faculty of desire there is the Reason which is practical without the mediation of any pleasure whatever. It determines for the faculty of desire, as a superior faculty, the final purpose which carries with it the pure intellectual satisfaction in the Object.— The concept formed by Judgement of a purposiveness of nature belongs to natural concepts, but only as a regulative principle of the cognitive faculty; although the aesthetical judgement upon certain objects (of Nature of Art) which occasions it is, in respect of the feeling of pleasure or pain, a constitutive principle. The spontaneity in the play of the cognitive faculties, the harmony of which contains the ground of this pleasure, makes the above concept [of the purposiveness of nature] fit to be the mediating link between the realm of the natural concept and that of the concept of freedom in its effects; whilst at the same time it promotes the sensibility of the mind for moral feeling.— The following table may facilitate the review of all the higher faculties according to their systematic unity.1
CRITIQUE OF THE AESTHETICAL JUDGEMENT
[1 ]One of the various pretended contradictions in this whole distinction of the causality of nature from that of freedom is this. It is objected that if I speak of obstacles which nature opposes to causality according to (moral) laws of freedom or of the assistance it affords, I am admitting an influence of the former upon the latter. But if we try to understand what has been said, this misinterpretation is very easy to avoid. The opposition or assistance is not between nature and freedom, but between the former as phenomenon and the effects of the latter as phenomena in the world of sense. The causality of freedom itself (of pure and practical Reason) is the causality of a natural cause subordinated to freedom (i.e. of the subject considered as man and therefore as phenomenon). The intelligible, which is thought under freedom, contains the ground of the determination of this [natural cause] in a way not explicable any further (just as that intelligible does which constitutes the supersensible substrate of nature).
[1 ]It has been thought a doubtful point that my divisions in pure Philosophy should always be threefold. But that lies in the nature of the thing. If there is to be an a priori division it must be either analytical, according to the law of contradiction, which is always twofold (quodlibet ens est aut A aut non A); or it is synthetical. And if in this latter case it is to be derived from a priori concepts (not as in Mathematic from the intuition corresponding to the concept), the division must necessarily be trichotomy. For according to what is requisite for synthetical unity in general there must be (1) a condition, (2) a conditioned, and (3) the concept which arises from the union of the conditioned with its condition.