Immanuel Kant - The Metaphysical Elements of Ethics

Setting aside the question what sort of end that is which is in itself a duty, and how such an end is possible, it is here only necessary to show that a duty of this kind is called a duty of virtue, and why it is so called.

To every duty corresponds a right of action (facultas moralis generatim), but all duties do not imply a corresponding right (facultas juridica) of another to compel anyone, but only the duties called legal duties. Similarly to all ethical obligation corresponds the notion of virtue, but it does not follow that all ethical duties are duties of virtue. Those, in fact, are not so which do not concern so much a certain end (matter, object of the elective will), but merely that which is formal in the moral determination of the will (e.g., that the dutiful action must also be done from duty). It is only an end which is also duty that can be called a duty of virtue. Hence there are several of the latter kind (and thus there are distinct virtues); on the contrary, there is only one duty of the former kind, but it is one which is valid for all actions (only one virtuous disposition).

The duty of virtue is essentially distinguished from the duty of justice in this respect; that it is morally possible to be externally compelled to the latter, whereas the former rests on free self-constraint only. For finite holy beings (which cannot even be tempted to the violation of duty) there is no doctrine of virtue, but only moral philosophy, the latter being an autonomy of practical reason, whereas the former is also an autocracy of it. That is, it includes a consciousness- not indeed immediately perceived, but rightly concluded, from the moral categorical imperative- of the power to become master of one's inclinations which resist the law; so that human morality in its highest stage can yet be nothing more than virtue; even if it were quite pure (perfectly free from the influence of a spring foreign to duty), a state which is poetically personified under the name of the wise man (as an ideal to which one should continually approximate).

Virtue, however, is not to be defined and esteemed merely as habit, and (as it is expressed in the prize essay of Cochius) as a long custom acquired by practice of morally good actions. For, if this is not an effect of well-resolved and firm principles ever more and more purified, then, like any other mechanical arrangement brought about by technical practical reason, it is neither armed for all circumstances nor adequately secured against the change that may be wrought by new allurements.

{INTRODUCTION ^paragraph 25}

To virtue = + a is opposed as its logical contradictory (contradictorie oppositum) the negative lack of virtue (moral weakness) = 0; but vice = – a is its contrary (contrarie s. realiter oppositum); and it is not merely a needless question but an offensive one to ask whether great crimes do not perhaps demand more strength of mind than great virtues. For by strength of mind we understand the strength of purpose of a man, as a being endowed with freedom, and consequently so far as he is master of himself (in his senses) and therefore in a healthy condition of mind. But great crimes are paroxysms, the very sight of which makes the man of healthy mind shudder. The question would therefore be something like this: whether a man in a fit of madness can have more physical strength than if he is in his senses; and we may admit this without on that account ascribing to him more strength of mind, if by mind we understand the vital principle of man in the free use of his powers. For since those crimes have their ground merely in the power of the inclinations that weaken reason, which does not prove strength of mind, this question would be nearly the same as the question whether a man in a fit of illness can show more strength than in a healthy condition; and this may be directly denied, since the want of health, which consists in the proper balance of all the bodily forces of the man, is a weakness in the system of these forces, by which system alone we can estimate absolute health.

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One who is acquainted with practical philosophy is not, therefore, a practical philosopher. The latter is he who makes the rational end the principle of his actions, while at the same time he joins with this the necessary knowledge which, as it aims at action, must not be spun out into the most subtile threads of metaphysic, unless a legal duty is in question; in which case meum and tuum must be accurately determined in the balance of justice, on the principle of equality of action and action, which requires something like mathematical proportion, but not in the case of a mere ethical duty. For in this case the question is not only to know what it is a duty to do (a thing which on account of the ends that all men naturally have can be easily decided), but the chief point is the inner principle of the will namely that the consciousness of this duty be also the spring of action, in order that we may be able to say of the man who joins to his knowledge this principle of wisdom that he is a practical philosopher.

Man, however, as at the same time a moral being, when he considers himself objectively, which he is qualified to do by his pure practical reason, (i.e. according to humanity in his own person), finds himself holy enough to transgress the law only unwillingly; for there is no man so depraved who in this transgression would not feel a resistance and an abhorrence of himself, so that he must put a force on himself. It is impossible to explain the phenomenon that at this parting of the ways (where the beautiful fable places Hercules between virtue and sensuality) man shows more propensity to obey inclination than the law. For, we can only explain what happens by tracing it to a cause according to physical laws; but then we should not be able to conceive the elective will as free. Now this mutually opposed self-constraint and the inevitability of it makes us recognize the incomprehensible property of freedom.

The less a man can be physically forced, and the more he can be morally forced (by the mere idea of duty), so much the freer he is. The man, for example, who is of sufficiently firm resolution and strong mind not to give up an enjoyment which he has resolved on, however much loss is shown as resulting therefrom, and who yet desists from his purpose unhesitatingly, though very reluctantly, when he finds that it would cause him to neglect an official duty or a sick father; this man proves his freedom in the highest degree by this very thing, that he cannot resist the voice of duty.