In Kant, who in this matter followed Calvin, the independence between the movement of nature, both within and without the soul, and the ideal of right was exaggerated into an opposition. The categorical imperative was always authoritative, but perhaps never obeyed. The divine law was far from being like the absolute Will in Fichte, Hegel, and Schopenhauer, a name for a universal metaphysical force, or even for the flux of material substance. On the contrary the sublimity of the categorical imperative lay precisely in the fact that, while matter and life moved on in their own unregenerate way, a principle which they ought to follow, overarched and condemned them, and constrained them to condemn themselves. Human nature was totally depraved and incapable of the least merit, nor had it any power of itself to become righteous. Its amiable spontaneous virtues, having but a natural motive, were splendid vices. Moral worth began only when the will, transformed at the touch of unmerited grace, surrendered every impulse in overwhelming reverence for the divine law.

This Calvinistic doctrine might seem to rebuke all actual inclinations, and far from making the will morally absolute, as egotism would, to raise over against it an alien authority, what ought to be willed. Such was, of course, Kant's ostensible intention; but sublime as such a situation was declared to be, he felt rather dissatisfied in its presence. A categorical imperative crying in the wilderness, a duty which nobody need listen to, or suffer for disregarding, seemed rather a forlorn authority. To save the face of absolute right another world seemed to be required, as in orthodox Christianity, in which it might be duly vindicated and obeyed.

Kant's scepticism, by which all knowledge of reality was denied us, played conveniently into the hands of this pious requirement. If the whole natural world, which we can learn something about by experience, is merely an idea in our minds, nothing prevents any sort of real but unknown world from lying about us unawares. What could be more plausible and opportune than that the categorical imperative which the human mind, the builder of this visible world, had rejected, should in that other real world be the head stone of the corner?

This happy thought, had it stood alone, might have seemed a little fantastic; but it was only a laboured means of re-establishing the theology of Leibniz, in which Kant privately believed, behind the transcendental idealism which he had put forward professorially. The dogmatic system from which he started seemed to him, as it stood, largely indefensible and a little oppressive. To purify it he adopted a fallacious principle of criticism, namely, that our ideas are all we can know, a principle which, if carried out, would undermine that whole system, and every other. He, therefore, hastened to adopt a corrective principle of reconstruction, no less fallacious, namely, that conscience bids us assume certain things to be realities which reason and experience know nothing of. This brought him round to a qualified and ambiguous form of his original dogmas, to the effect that although there was no reason to think that God, heaven, and free-will exist, we ought to act as if they existed, and might call that wilful action of ours faith in their existence.

Thus in the philosophy of Kant there was a stimulating ambiguity in the issue. He taught rather less than he secretly believed, and his disciples, seizing the principle of his scepticism, but lacking his conservative instincts, believed rather less than he taught them. Doubtless in his private capacity Kant hoped, if he did not believe, that God, free-will, and another life subsisted in fact, as every believer had hitherto supposed; it was only the method of proving their reality that had been illegitimate. For no matter how strong the usual arguments might seem (and they did not seem very strong) they could convey no transcendent assurance; on the contrary, the more proofs you draw for anything from reason and experience, the better you prove that that thing is a mere idea in your mind. It was almost prudent, so to speak, that God, freedom, and immortality, if they had claims to reality, should remain without witness in the sphere of "knowledge," as inadvertently or ironically it was still called; but to circumvent this compulsory lack of evidence God had at least implanted in us a veridical conscience, which if it took itself seriously (as it ought to do, being a conscience) would constrain us to postulate what, though we could never "know" it, happened to be the truth. Such was the way in which the good Kant thought to play hide-and-seek with reality.

The momentum of his transcendental method, however, led to a very different and quite egotistical conclusion. An adept in transcendentalism can hardly suppose that God, free-will, and heaven, even if he postulates them, need exist at all. Existence, for him, is an altogether inferior category. Even a specific moral law, thundering unalterable maxims, must seem to him a childish notion. What the ego postulates is nothing fixed and already existing, but only such ideal terms as, for the moment, express its attitude. If it is striving to remember, it posits a past; if it is planning, it posits a future; if it is consciously eloquent, it posits an audience. These things do not and cannot exist otherwise than in their capacity of things posited by the ego. All, therefore, that the categorical imperative can mean for the complete transcendentalist is that he should live as if all things were real which are imaginatively requisite for him, if he is to live hard: this intensity of life in him being itself the only reality. At that stage of development at which Kant found himself, God, freedom, and immortality may have been necessary postulates of practical reason. But to suppose that these imagined objects, therefore, existed apart from the excellent philosopher whose conscience had not yet transcended them, would be not to have profited by his teaching. It would be merely to repeat it. A later and more advanced transcendentalist, instead of God, freedom, and immortality, might just as dutifully posit matter, empire, and the beauty of a warrior's death. His conscience might no longer be an echo of Christianity, but the trumpet-blast of a new heathenism. It is for the ego who posits to judge what it should posit.

The postulates of practical reason, by which Kant hoped to elude the subjectivity which he attributed to knowledge, are no less subjective than knowledge, and far more private and variable. The senses and the intellect, if they deceive us, seem to deceive us all in much the same way, and the dream they plunge us into in common seems to unite us; but what obscurity, diversity, hostility in the ideals of our hearts! The postulates that were intended to save the Kantian philosophy from egotism are the most egotistical part of it. In the categorical imperative we see something native and inward to the private soul, in some of its moods, quietly claiming to rule the invisible world, to set God on his throne and open eternity to the human spirit. The most subjective of feelings, the feeling of what ought to be, legislates for the universe. Egotism could hardly go further.

But this is not all. The categorical imperative, not satisfied with proclaiming itself secretly omnipotent, proclaims itself openly ruthless. Kant expressly repudiated as unworthy of a virtuous will any consideration of happiness, or of consequences, either to oneself or to others. He was personally as mild and kindly as the Vicar of Wakefield (whose goodness he denied to be moral because it was natural), but his moral doctrine was in principle a perfect frame for fanaticism. Give back, as time was bound to give back, a little flesh to this skeleton of duty, make it the voice not of a remote Mosaic decalogue, but of a rich temperament and a young life, and you will have sanctified beforehand every stubborn passion and every romantic crime. In the guise of an infallible conscience, before which nothing has a right to stand, egotism is launched upon its irresponsible career.

The categorical imperative, as Kant personally conceived it, was that of the conscience of the eighteenth century, which had become humanitarian without ceasing to be Christian, the conscience of the Puritans passing into that of Rousseau. But the categorical principle in morals, like the ego in logic, can easily migrate. If to-day you are right in obeying your private conscience against all considerations of prudence or kindness (though you are prudent and kind by nature, so that this loyalty to a ruthless Duty is a sacrifice for you), to-morrow you may be right in obeying the categorical imperative of your soul in another phase, and to carry out no matter what irresponsible enterprise, though your heart may bleed at the victims you are making. The principle of fanaticism is present in either case; and Kant provides, in his transcendental agnosticism, a means of cutting off all protests from experience or common sense, or a more enlightened self-interest. These protests, he thinks, are not only ignoble, but they come from a deluded mind, since the world they regard is a creature of the imagination, whereas the categorical imperative, revealed to the inner man, is a principle prior to all worlds and, therefore, not to be corrected by any suasion which this particular world, now imagined by us, might try to exercise on our free minds.