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In this way Theology leads immediately to Religion, i.e. the recognition of our duties as divine commands159; because it is only the recognition of our duty and of the final purpose enjoined upon us by Reason which brings out with definiteness the concept of God. This concept, therefore, is inseparable in its origin from obligation to that Being. On the other hand, even if the concept of the original Being could be also found determinately by the merely theoretical path (viz. the concept of it as mere Cause of nature), it would afterwards be very difficult—perhaps impossible without arbitrary interpolation [of elements]—to ascribe to this Being by well-grounded proofs a causality in accordance with moral laws; and yet without this that quasi-theological concept could furnish no foundation for religion. Even if a religion could be established by this theoretical path, it would actually, as regards sentiment (wherein its essence lies) be different from that in424 which the concept of God and the (practical) conviction of His Being originate from the fundamental Ideas of morality. For if we must suppose the Omnipotence, Omniscience, etc., of an Author of the world as concepts given to us from another quarter, in order afterwards only to apply our concepts of duties to our relation to Him, then these latter concepts must bear very markedly the appearance of compulsion and forced submission. If, instead of this, the respect for the moral law, quite freely, in virtue of the precept of our own Reason, represents to us the final purpose of our destination, we admit among our moral views a Cause harmonising with this and with its accomplishment, with the sincerest reverence, which is quite distinct from pathological fear; and we willingly submit ourselves thereto.160

If it be asked why it is incumbent upon us to have any Theology at all, it appears clear that it is not needed for the extension or correction of our cognition of nature or in general for any theory, but simply in a subjective point of view for Religion, i.e. the practical or moral use of our Reason. If it is found that the only argument which leads to a definite concept of the object of Theology is itself moral, it is not only not strange, but we miss nothing in respect of its final purpose as regards425 the sufficiency of belief from this ground of proof, provided that it be admitted that such an argument only establishes the Being of God sufficiently for our moral destination, i.e. in a practical point of view, and that here speculation neither shows its strength in any way, nor extends by means of it the sphere of its domain. Our surprise and the alleged contradiction between the possibility of a Theology asserted here and that which the Critique of speculative Reason said of the Categories—viz. that they can only produce knowledge when applied to objects of sense, but in no way when applied to the supersensible—vanish, if we see that they are here used for a cognition of God not in a theoretical point of view (in accordance with what His own nature, inscrutable to us, may be) but simply in a practical.—In order then at this opportunity to make an end of the misinterpretation of that very necessary doctrine of the Critique, which, to the chagrin of the blind dogmatist, refers Reason to its bounds, I add here the following elucidation.

If I ascribe to a body motive force and thus think it by means of the category of causality, then I at the same time cognise it by that [category]; i.e. I determine the concept of it, as of an Object in general, by means of what belongs to it by itself (as the condition of the possibility of that relation) as an object of sense. If the motive force ascribed to it is repulsive, then there belongs to it (although I do not place near it any other body upon which it may exert force) a place in space, and moreover extension, i.e. space in itself, besides the filling up of this by means of the repulsive forces of its parts. In addition there is the law of this426 filling up (that the ground of the repulsion of the parts must decrease in the same proportion as the extension of the body increases, and as the space, which it fills with the same parts by means of this force, is augmented).—On the contrary, if I think a supersensible Being as the first mover, and thus by the category of causality as regards its determination of the world (motion of matter), I must not think it as existing in any place in space nor as extended; I must not even think it as existing in time or simultaneously with other beings. Hence I have no determinations whatever, which could make intelligible to me the condition of the possibility of motion by means of this Being as its ground. Consequently, I do not in the very least cognise it by means of the predicate of Cause (as first mover), for itself; but I have only the representation of a something containing the ground of the motions in the world; and the relation of the latter to it as their cause, since it does not besides furnish me with anything belonging to the constitution of the thing which is cause, leaves its concept quite empty. The reason of this is, that by predicates which only find their Object in the world of sense I can indeed proceed to the being of something which must contain their ground, but not to the determination of its concept as a supersensible being, which excludes all these predicates. By the category of causality, then, if I determine it by the concept of a first mover, I do not in the very least cognise what God is. Perhaps, however, I shall have better success if I start from the order of the world, not merely to think its causality as that of a supreme Understanding, but to cognise it by means of this determination of the said concept;427 because here the troublesome condition of space and of extension disappears.—At all events the great purposiveness in the world compels us to think a supreme cause of it, and to think its causality as that of an Understanding; but we are not therefore entitled to ascribe this to it. (E.g. we think of the eternity of God as presence in all time, because we can form no other concept of mere being as a quantum, i.e. as duration; or we think of the divine Omnipresence as presence in all places in order to make comprehensible to ourselves His immediate presence in things which are external to one another; without daring to ascribe to God any of these determinations, as something cognised in Him.) If I determine the causality of a man, in respect of certain products which are only explicable by designed purposiveness, by thinking it as that of Understanding, I need not stop here, but I can ascribe to him this predicate as a well-known property and cognise him accordingly. For I know that intuitions are given to the senses of men and are brought by the Understanding under a concept and thus under a rule; that this concept only contains the common characteristic (with omission of the particular ones) and is thus discursive; and that the rules for bringing given representations under a consciousness in general are given by Understanding before those intuitions, etc. I therefore ascribe this property to man as a property by means of which I cognise him. However, if I wish to think a supersensible Being (God) as an intelligence, this is not only permissible in a certain aspect of my employment of Reason—it is unavoidable; but to ascribe to Him Understanding and to flatter ourselves that we can cognise Him by428 means of it as a property of His, is in no way permissible. For I must omit all those conditions under which alone I know an Understanding, and thus the predicate which only serves for determining man cannot be applied at all to a supersensible Object; and therefore by a causality thus determined, I cannot cognise what God is. And so it is with all Categories, which can have no significance for cognition in a theoretical aspect, if they are not applied to objects of possible experience.—However, according to the analogy of an Understanding I can in a certain other aspect think a supersensible being, without at the same time meaning thereby to cognise it theoretically; viz. if this determination of its causality concerns an effect in the world, which contains a design morally necessary but unattainable by a sensible being. For then a cognition of God and of His Being (Theology) is possible by means of properties and determinations of His causality merely thought in Him according to analogy, which has all requisite reality in a practical reference though only in respect of this (as moral).—An Ethical Theology is therefore possible; for though morality can subsist without theology as regards its rule, it cannot do so as regards the final design which this proposes, unless Reason in respect of it is to be renounced. But a Theological Ethic (of pure Reason) is impossible; for laws which Reason itself does not give and whose observance it does not bring about as a pure practical faculty, can not be moral. In the same way a Theological Physic would be a nonentity, for it would propose no laws of nature but ordinances of a Highest Will; while on the other hand a physical (properly speaking a physico-teleological) Theology can serve at429 least as a propaedeutic to Theology proper, by giving occasion for the Idea of a final purpose which nature cannot present by the observation of natural purposes of which it offers abundant material. It thus makes felt the need of a Theology which shall determine the concept of God adequately for the highest practical use of Reason, but it cannot develop this and base it satisfactorily on its proofs.