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But in fact, whatever men imagine, no moral principle is based on any feeling, but such a principle is really nothing else than an obscurely conceived metaphysic which inheres in every man's reasoning faculty; as the teacher will easily find who tries to catechize his pupils in the Socratic method about the imperative of duty and its application to the moral judgement of his actions. The mode of stating it need not be always metaphysical, and the language need not necessarily be scholastic, unless the pupil is to be trained to be a philosopher. But the thought must go back to the elements of metaphysics, without which we cannot expect any certainty or purity, or even motive power in ethics.
If we deviate from this principle and begin from pathological, or purely sensitive, or even moral feeling (from what is subjectively practical instead of what is objective), that is, from the matter of the will, the end, not from its form that is the law, in order from thence to determine duties; then, certainly, there are no metaphysical elements of ethics, for feeling by whatever it may be excited is always physical. But then ethical teaching, whether in schools, or lecture-rooms, etc., is corrupted in its source. For it is not a matter of indifference by what motives or means one is led to a good purpose (the obedience to duty). However disgusting, then, metaphysics may appear to those pretended philosophers who dogmatize oracularly, or even brilliantly, about the doctrine of duty, it is, nevertheless, an indispensable duty for those who oppose it to go back to its principles even in ethics, and to begin by going to school on its benches.
We may fairly wonder how, after all previous explanations of the principles of duty, so far as it is derived from pure reason, it was still possible to reduce it again to a doctrine of happiness; in such a way, however, that a certain moral happiness not resting on empirical causes was ultimately arrived at, a self-contradictory nonentity. In fact, when the thinking man has conquered the temptations to vice, and is conscious of having done his (often hard) duty, he finds himself in a state of peace and satisfaction which may well be called happiness, in which virtue is her own reward. Now, says the eudaemonist, this delight, this happiness, is the real motive of his acting virtuously. The notion of duty, says be, does not immediately determine his will; it is only by means of the happiness in prospect that he is moved to his duty. Now, on the other hand, since he can promise himself this reward of virtue only from the consciousness of having done his duty, it is clear that the latter must have preceded: that is, be must feel himself bound to do his duty before he thinks, and without thinking, that happiness will be the consequence of obedience to duty. He is thus involved in a circle in his assignment of cause and effect. He can only hope to be happy if he is conscious of his obedience to duty: and he can only be moved to obedience to duty if be foresees that he will thereby become happy. But in this reasoning there is also a contradiction. For, on the one side, he must obey his duty, without asking what effect this will have on his happiness, consequently, from a moral principle; on the other side, he can only recognize something as his duty when he can reckon on happiness which will accrue to him thereby, and consequently on a pathological principle, which is the direct opposite of the former.
I have in another place (the Berlin Monatsschrift), reduced, as I believe, to the simplest expressions the distinction between pathological and moral pleasure. The pleasure, namely, which must precede the obedience to the law in order that one may act according to the law is pathological, and the process follows the physical order of nature; that which must be preceded by the law in order that it may be felt is in the moral order. If this distinction is not observed; if eudaemonism (the principle of happiness) is adopted as the principle instead of eleutheronomy (the principle of freedom of the inner legislation), the consequence is the euthanasia (quiet death) of all morality.
{PREFACE ^paragraph 10}
{The cause of these mistakes is no other than the following: Those who are accustomed only to physiological explanations will not admit into their heads the categorical imperative from which these laws dictatorially proceed, notwithstanding that they feel themselves irresistibly forced by it. Dissatisfied at not being able to explain what lies wholly beyond that sphere, namely, freedom of the elective will, elevating as is this privilege, that man has of being capable of such an idea. They are stirred up by the proud claims of speculative reason, which feels its power so strongly in the fields, just as if they were allies leagued in defence of the omnipotence of theoretical reason and roused by a general call to arms to resist that idea; and thus they are at present, and perhaps for a long time to come, though ultimately in vain, to attack the moral concept of freedom and if possible render it doubtful.
Ethics in ancient times signified moral philosophy (philosophia moral is) generally, which was also called the doctrine of duties. Subsequently it was found advisable to confine this name to a part of moral philosophy, namely, to the doctrine of duties which are not subject to external laws (for which in German the name Tugendlehre was found suitable). Thus the system of general deontology is divided into that of jurisprudence (jurisprudentia), which is capable of external laws, and of ethics, which is not thus capable, and we may let this division stand.
I. Exposition of the Conception of Ethics
The notion of duty is in itself already the notion of a constraint of the free elective will by the law; whether this constraint be an external one or be self-constraint. The moral imperative, by its categorical (the unconditional ought) announces this constraint, which therefore does not apply to all rational beings (for there may also be holy beings), but applies to men as rational physical beings who are unholy enough to be seduced by pleasure to the transgression of the moral law, although they themselves recognize its authority; and when they do obey it, to obey it unwillingly (with resistance of their inclination); and it is in this that the constraint properly consists. * Now, as man is a free (moral) being, the notion of duty can contain only self-constraint (by the idea of the law itself), when we look to the internal determination of the will (the spring), for thus only is it possible to combine that constraint (even if it were external) with the freedom of the elective will. The notion of duty then must be an ethical one.