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INTRODUCTION ^paragraph 160
First. A duty can have only a single ground of obligation; and if two or more proof of it are adduced, this is a certain mark that either no valid proof has yet been given, or that there are several distinct duties which have been regarded as one.
For all moral proofs, being philosophical, can only be drawn by means of rational knowledge from concepts, not like mathematics, through the construction of concepts. The latter science admits a variety of proofs of one and the same theorem; because in intuition a priori there may be several properties of an object, all of which lead back to the very same principle. If, for instance, to prove the duty of veracity, an argument is drawn first from the harm that a lie causes to other men; another from the worthlessness of a liar and the violation of his own self-respect, what is proved in the former argument is a duty of benevolence, not of veracity, that is to say, not the duty which required to be proved, but a different one. Now, if, in giving a variety of proof for one and the same theorem, we flatter ourselves that the multitude of reasons will compensate the lack of weight in each taken separately, this is a very unphilosophical resource, since it betrays trickery and dishonesty; for several insufficient proofs placed beside one another do not produce certainty, nor even probability. They should advance as reason and consequence in a series, up to the sufficient reason, and it is only in this way that they can have the force of proof. Yet the former is the usual device of the rhetorician.
Secondly. The difference between virtue and vice cannot be sought in the degree in which certain maxims are followed, but only in the specific quality of the maxims (their relation to the law). In other words, the vaunted principle of Aristotle, that virtue is the mean between two vices, is false. * For instance, suppose that good management is given as the mean between two vices, prodigality and avarice; then its origin as a virtue can neither be defined as the gradual diminution of the former vice (by saving), nor as the increase of the expenses of the miserly. These vices, in fact, cannot be viewed as if they, proceeding as it were in opposite directions, met together in good management; but each of them has its own maxim, which necessarily contradicts that of the other. INTRODUCTION ^paragraph 165
* The common classical formulae of ethics- medio tutissimus
ibis; omne mimium vertitur in vitium; est modus in rebus,
etc., medium tenuere beati; virtus est medium vitiorum et
utrinque reductum-["You will go most safely in the middle"
(Virgil); "Every excess develops into a vice"; "There is a
mean in all things, etc." (Horace); "Happy they who steadily
pursue a middle course"; "Virtue is the mean between two
vices and equally removed from either" (Horace).]-contain a
poor sort of wisdom, which has no definite principles; for
this mean between two extremes, who will assign it for me?
Avarice (as a vice) is not distinguished from frugality (as
a virtue) by merely being the latter pushed too far; but has
a quite different principle (maxim), namely placing the end
of economy not in the enjoyment of one's means, but in the
mere possession of them, renouncing enjoyment; just as the
vice of prodigality is not to be sought in the excessive
enjoyment of one's means, but in the bad maxim which makes
the use of them, without regard to their maintenance, the
sole end.
For the same reason, no vice can be defined as an excess in the practice of certain actions beyond what is proper (e.g., Prodigalitas est excessus in consumendis opibus); or, as a less exercise of them than is fitting (Avaritia est defectus, etc.). For since in this way the degree is left quite undefined, and the question whether conduct accords with duty or not, turns wholly on this, such an account is of no use as a definition.
Thirdly. Ethical virtue must not be estimated by the power we attribute to man of fulfilling the law; but, conversely, the moral power must be estimated by the law, which commands categorically; not, therefore, by the empirical knowledge that we have of men as they are, but by the rational knowledge how, according to the ideas of humanity, they ought to be. These three maxims of the scientific treatment of ethics are opposed to the older apophthegms: INTRODUCTION ^paragraph 170
1. There is only one virtue and only one vice.
2. Virtue is the observance of the mean path between two opposite vices.
3. Virtue (like prudence) must be learned from experience.
INTRODUCTION ^paragraph 175
Virtue signifies a moral strength of will. But this does not exhaust the notion; for such strength might also belong to a holy (superhuman) being, in whom no opposing impulse counteracts the law of his rational will; who therefore willingly does everything in accordance with the law. Virtue then is the moral strength of a man's will in his obedience to duty; and this is a moral necessitation by his own law giving reason, inasmuch as this constitutes itself a power executing the law. It is not itself a duty, nor is it a duty to possess it (otherwise we should be in duty bound to have a duty), but it commands, and accompanies its command with a moral constraint (one possible by laws of internal freedom). But since this should be irresistible, strength is requisite, and the degree of this strength can be estimated only by the magnitude of the hindrances which man creates for himself, by his inclinations. Vices, the brood of unlawful dispositions, are the monsters that he has to combat; wherefore this moral strength as fortitude (fortitudo moralis) constitutes the greatest and only true martial glory of man; it is also called the true wisdom, namely, the practical, because it makes the ultimate end of the existence of man on earth its own end. Its possession alone makes man free, healthy, rich, a king, etc., nor either chance or fate deprive him of this, since he possesses himself, and the virtuous cannot lose his virtue.
All the encomiums bestowed on the ideal of humanity in its moral perfection can lose nothing of their practical reality by the examples of what men now are, have been, or will probably be hereafter; anthropology which proceeds from mere empirical knowledge cannot impair anthroponomy which is erected by the unconditionally legislating reason; and although virtue may now and then be called meritorious (in relation to men, not to the law), and be worthy of reward, yet in itself, as it is its own end, so also it must be regarded as its own reward.
Virtue considered in its complete perfection is, therefore, regarded not as if man possessed virtue, but as if virtue possessed the man, since in the former case it would appear as though he had still had the choice (for which he would then require another virtue, in order to select virtue from all other wares offered to him). To conceive a plurality of virtues (as we unavoidably must) is nothing else but to conceive various moral objects to which the (rational) will is led by the single principle of virtue; and it is the same with the opposite vices. The expression which personifies both is a contrivance for affecting the sensibility, pointing, however, to a moral sense. Hence it follows that an aesthetic of morals is not a part, but a subjective exposition of the Metaphysic of Morals; in which the emotions that accompany the force of the moral law make the that force to be felt; for example: disgust, horror, etc., which gives a sensible moral aversion in order to gain the precedence from the merely sensible incitement. INTRODUCTION ^paragraph 180
