Kant parted company with the empirical philosophy which had held that all knowledge arises from without, comes from experienced sensations, is essentially perception. This theory had not been able to explain the fact that human experience always conforms to certain laws. On the other hand, the philosophy of so-called innate ideas had sought to derive all knowledge from the constitution of the mind itself. It left out of consideration the dependence of the mind upon experience. It tended to confound the creations of its own speculation with reality, or rather, to claim correspondence with fact for statements which had no warrant in experience. There was no limit to which this speculative process might not be pushed. By this process the medieval theologians, with all gravity, propounded the most absurd speculations concerning nature. By this process men made the most astonishing declarations upon the basis, as they supposed, of revelation. They made allegations concerning history and the religious experience which the most rudimentary knowledge of history or reflection upon consciousness proved to be quite contrary to fact.

Both empiricism and the theory of innate ideas had agreed in regarding all knowledge as something given, from without or from within. The knowing mind was only a passive recipient of impressions thus imparted to it. It was as wax under the stylus, tabula rasa, clean paper waiting to be written upon. Kant departed from this radically. He declared that all cognition rests upon the union of the mind's activity with its receptivity. The material of thought, or at least some of the materials of thought, must be given us in the multiformity of our perceptions, through what we call experience from the outer world. On the other hand, the formation of this material into knowledge is the work of the activity of our own minds. Knowledge is the result of the systematising of experience and of reflection upon it. This activity of the mind takes place always in accordance with the mind's own laws. Kant held them to the absolute dependence of knowledge upon material applied in experience. He compared himself to Copernicus who had taught men that they themselves revolved around a central fact of the universe. They had supposed that the facts revolved about them. The central fact of the intellectual world is experience. This experience seems to be given us in the forms of time and space and cause. These are merely forms of the mind's own activity. It is not possible for us to know 'the thing in itself,' the Ding an sich in Kant's phrase, which is the external factor in any sensation or perception. We cannot distinguish that external factor from the contribution to it, as it stands in our perception, which our own minds have made. If we cannot do that even for ourselves, how much less can we do it for others! It is the subject, the thinking being who says 'I,' which, by means of its characteristic and necessary active processes, in the perception of things under the forms of time and space, converts the chaotic material of knowledge into a regular and ordered world of reasoned experience. In this sense the understanding itself imposes laws, if not upon nature, yet, at least, upon nature as we can ever know it. There is thus in Kant's philosophy a sceptical aspect. Knowledge is limited to phenomena. We cannot by pure reason know anything of the world which lies beyond experience. This thought had been put forth by Locke and Berkeley, and by Hume also, in a different way. But with Kant this scepticism was not the gist of his philosophy. It was urged rather as the basis of the unconditioned character which he proposed to assert for the practical reason. Kant's scepticism is therefore very different from that of Hume. It does not militate against the profoundest religious conviction. Yet it prepared the way for some of the just claims of modern agnosticism.

According to Kant, it is as much the province of the practical reason to lay down laws for action as it is the province of pure reason to determine the conditions of thought, though the practical reason can define only the form of action which shall be in the spirit of duty. It cannot present duty to us as an object of desire. Desire can be only a form of self-love. In the end it reckons with the advantage of having done one's duty. It thus becomes selfish and degraded. The identification of duty and interest was particularly offensive to Kant. He was at war with every form of hedonism. To do one's duty because one expects to reap advantage is not to have done one's duty. The doing of duty in this spirit simply resolves itself into a subtler and more pervasive form of selfishness. He castigates the popular presentation of religion as fostering this same fault. On the other hand, there is a trait of rigorism in Kant, a survival of the ancient dualism, which was not altogether consistent with the implications of his own philosophy. This philosophy afforded, as we have seen, the basis for a monistic view of the universe. But to his mind the natural inclinations of man are opposed to good conscience and sound reason. He had contempt for the shallow optimism of his time, according to which the nature of man was all good, and needed only to be allowed to run its natural course to produce highest ethical results. He does not seem to have penetrated to the root of Rousseau's fallacy, the double sense in which he constantly used the words 'nature' and 'natural.' Otherwise, Kant would have been able to repudiate the preposterous doctrine of Rousseau, without himself falling back upon the doctrine of the radical evil of human nature. In this doctrine he is practically at one with the popular teaching of his own pietistic background, and with Calvinism as it prevailed with many of the religiously-minded of his day. In its extreme statements the latter reminds one of the pagan and oriental dualisms which so long ran parallel to the development of Christian thought and so profoundly influenced it.

Kant's system is not at one with itself at this point. According to him the natural inclinations of men are such as to produce a never-ending struggle between duty and desire. To desire to do a thing made him suspicious that he was not actuated by the pure spirit of duty in doing it. The sense in which man may be in his nature both a child of God, and, at the same time, part of the great complex of nature, was not yet clear either to Kant or to his opponents. His pessimism was a reflection of his moral seriousness. Yet it failed to reckon with that which is yet a glorious fact. One of the chief results of doing one's duty is the gradual escape from the desire to do the contrary. It is the gradual fostering by us, the ultimate dominance in us, of the desire to do that duty. Even to have seen one's duty is the dawning in us of this high desire. In the lowest man there is indeed the superficial desire to indulge his passions. There is also the latent longing to be conformed to the good. There is the sense that he fulfils himself then only when he is obedient to the good. One of the great facts of spiritual experience is this gradual, or even sudden, inversion of standard within us. We do really cease to desire the things which are against right reason and conscience. We come to desire the good, even if it shall cost us pain and sacrifice to do it. Paul could write: 'When I would do good, evil is present with me.' But, in the vividness of his identification of his willing self with his better self against his sinning self, he could also write: 'So then it is no more I that do the sin.' Das radicale Böse of human nature is less radical than Kant supposed, and 'the categorical imperative' of duty less externally categorical than he alleged. Still it is the great merit of Kant's philosophy to have brought out with all possible emphasis, not merely as against the optimism of the shallow, but as against the hedonism of soberer people, that our life is a conflict between inclination and duty. The claims of duty are the higher ones. They are mandatory, absolute. We do our duty whether or not we superficially desire to do it. We do our duty whether or not we foresee advantage in having done it. We should do it if we foresaw with clearness disadvantage. We should find our satisfaction in having done it, even at the cost of all our other satisfactions. There is a must which is over and above all our desires. This is what Kant really means by the categorical imperative. Nevertheless, his statement comes in conflict with the principle of freedom, which is one of the most fundamental in his system. The phrases above used only eddy about the one point which is to be held fast. There may be that in the universe which destroys the man who does not conform to it, but in the last analysis he is self-destroyed, that is, he chooses not to conform. If he is saved, it is because he chooses thus to conform. Man would be then most truly man in resisting that which would merely overpower him, even if it were goodness. Of course, there can be no goodness which overpowers. There can be no goodness which is not willed. Nothing can be a motive except through awakening our desire. That which one desires is never wholly external to oneself.

According to Kant, morality becomes religion when that which the former shows to be the end of man is conceived also to be the end of the supreme law-giver, God. Religion is the recognition of our duties as divine commands. The distinction between revealed and natural religion is stated thus: In the former we know a thing to be a divine command before we recognise it as our duty. In the latter we know it to be our duty before we recognise it as a divine command. Religion may be both natural and revealed. Its tenets may be such that man can be conceived as arriving at them by unaided reason. But he would thus have arrived at them at a later period in the evolution of the race. Hence revelation might be salutary or even necessary for certain times and places without being essential at all times or, for that matter, a permanent guarantee of the truth of religion. There is nothing here which is new or original with Kant. This line of reasoning was one by which men since Lessing had helped themselves over certain difficulties. It is cited only to show how Kant, too, failed to transcend his age in some matters, although he so splendidly transcended it in others.

The orthodox had immemorially asserted that revelation imparted information not otherwise attainable, or not then attainable. The rationalists here allege the same. Kant is held fast in this view. Assuredly what revelation imparts is not information of any sort whatsoever, not even information concerning God. What revelation imparts is God himself, through the will and the affection, the practical reason. Revelation is experience, not instruction. The revealers are those who have experienced God, Jesus the foremost among them. They have experienced God, whom then they have manifested as best they could, but far more significantly in what they were than in what they said. There is surely the gravest exaggeration of what is statutory and external in that which Kant says of the relation of ethics and religion. How can we know that to be a command of God, which does not commend itself in our own heart and conscience? The traditionalist would have said, by documents miraculously confirmed. It was not in consonance with his noblest ideas for Kant to say that. On the other hand, that which I perceive to be my duty I, as religious man, feel to be a command of God, whether or not a mandate of God to that effect can be adduced. Whether an alleged revelation from God inculcates such a truth or duty may be incidental. In a sense it is accidental. The content of all historic revelation is conditioned in the circumstances of the man to whom the revelation is addressed. It is clear that the whole matter of revelation is thus apprehended by Kant with more externality than we should have believed. His thought is still essentially archaic and dualistic. He is, therefore, now and then upon the point of denying that such a thing as revelation is possible. The very idea of revelation, in this form, does violence to his fundamental principle of the autonomy of the human reason and will. At many points in his reflection it is transparently clear that nothing can ever come to a man, or be given forth by him, which is not creatively shaped by himself. As regards revelation, however, Kant never frankly took that step. The implications of his own system would have led him to that step. They led to an idea of revelation which was psychologically in harmony with the assumptions of his system, and historically could be conceived as taking place without the interjection of the miraculous in the ordinary sense. If the divine revelation is to be thought as taking place within the human spirit, and in consonance with the laws of all other experience, then the human spirit must itself be conceived as standing in such relation to the divine that the eternal reason may express and reveal itself in the regular course of the mind's own activity. Then the manifold moral and religious ideals of mankind in all history must take their place as integral factors also in the progress of the divine revelation.

When we come to the more specific topics of his religious teaching, freedom, immortality, God, Kant is prompt to assert that these cannot be objects of theoretical knowledge. Insoluble contradictions arise whenever a proof of them is attempted. If an object of faith could be demonstrated it would cease to be an object of faith. It would have been brought down out of the transcendental world. Were God to us an object among other objects, he would cease to be a God. Were the soul a demonstrable object like any other object, it would cease to be the transcendental aspect of ourselves. Kant makes short work of the so-called proofs for the existence of God which had done duty in the scholastic theology. With subtilty, sometimes also with bitter irony, he shows that they one and all assume that which they set out to prove. They are theoretically insufficient and practically unnecessary. They have such high-sounding names—the ontological argument, the cosmological, the physico-theological—that almost in spite of ourselves we bring a reverential mood to them. They have been set forth with solemnity by such redoubtable thinkers that there is something almost startling in the way that Kant knocks them about. The fact that the ordinary man among us easily perceives that Kant was right shows only how the climate of the intellectual world has changed. Freedom, immortality, God, are not indeed provable. If given at all, they can be given only in the practical reason. Still they are postulates in the moral order which makes man the citizen of an intelligible world. There can be no 'ought' for a being who is necessitated. We can perceive, and do perceive, that we ought to do a thing. It follows that we can do it. However, the hindrances to the realisation of the moral ideal are such that it cannot be realised in a finite time. Hence the postulate of eternal life for the individual. Finally, reason demands realisation of a supreme good, both a perfect virtue and a corresponding happiness. Man is a final end only as a moral subject. There must be One who is not only a law-giver, but in himself also the realisation of the law of the moral world.

Kant's moral argument thus steps off the line of the others. It is not a proof at all in the sense in which they attempted to be proofs. The existence of God appears as a necessary assumption, if the highest good and value in the world are to be fulfilled. But the conception and possibility of realisation of a highest good is itself something which cannot be concluded with theoretical evidentiality. It is the object of a belief which in entire freedom is directed to that end. Kant lays stress upon the fact that among the practical ideas of reason, that of freedom is the one whose reality admits most nearly of being proved by the laws of pure reason, as well as in conduct and experience. Upon an act of freedom, then, belief rests. 'It is the free holding that to be true, which for the fulfilment of a purpose we find necessary.' Now, as object of this 'free holding something to be true,' he sets forth the conception of the highest good in the world, to be realised through freedom. It is clear that before this argument would prove that a God is necessary to the realisation of the moral order, it would have to be shown that there are no adequate forces immanent within society itself for the establishment and fulfilment of that order. As a matter of fact, reflexion in the nineteenth century, devoted as it has been to the evolution of society, has busied itself with hardly anything more than with the study of those immanent elements which make for morality. It is therefore not an external guarantor of morals, such as Kant thought, which is here given. It is the immanent God who is revealed in the history and life of the race, even as also it is the immanent God who is revealed in the consciousness of the individual soul. Even the moral argument, therefore, in the form in which Kant puts it, sounds remote and strange to us. His reasoning strains and creaks almost as if he were still trying to do that which he had just declared could not be done. What remains of significance for us, is this. All the debate about first causes, absolute beings, and the rest, gives us no God such as our souls need. If a man is to find the witness for soul, immortality and God at all, he must find it within himself and in the spiritual history of his fellows. He must venture, in freedom, the belief in these things, and find their corroboration in the contribution which they make to the solution of the mystery of life. One must venture to win them. One must continue to venture, to keep them. If it were not so, they would not be objects of faith.

The source of the radical evil in man is an intelligible act of human freedom not further to be explained. Moral evil is not, as such, transmitted. Moral qualities are inseparable from the responsibility of the person who commits the deeds. Yet this radical disposition to evil is to be changed into a good one, not altogether by a process of moral reformation. There is such a thing as a fundamental revolution of a man's habit of thought, a conscious and voluntary transference of a man's intention to obey, from the superficial and selfish desires which he has followed, to the deep and spiritual ones which he will henceforth allow. There is an epoch in a man's life when he makes the transition. He probably does it under the spell of personal influence, by the power of example, through the beauty of another personality. To Kant salvation was character. It was of and in and by character. To no thinker has the moral participation of a man in the regeneration of his own character been more certain and necessary than to Kant. Yet, the change in direction of the will generally comes by an impulse from without. It comes by the impress of a noble personality. It is sustained by enthusiasm for that personality. Kant has therefore a perfectly rational and ethical and vital meaning for the phrase 'new birth.'

For the purpose of this impulse to goodness, nothing is so effective as the contemplation of an historical example of such surpassing moral grandeur as that which we behold in Jesus. For this reason we may look to Jesus as the ideal of goodness presented to us in flesh and blood. Yet the assertion that Jesus' historical personality altogether corresponds with the complete and eternal ethical ideal is one which we have no need to make. We do not possess in our own minds the absolute ideal with which in that assertion we compare him.