confident: and passion is the actual setting in motion of that power, being itself anger, confidence, or shame; and habit is the strong formation of power in the unreasoning element engendered by use, being vice if the passions are badly tutored by reason, virtue if they are well tutored.
§ v. But since they do not regard every virtue as a mean, nor call it moral, we must discuss this difference by approaching the matter more from first principles. Some things in the world exist absolutely, as the earth, the sky, the stars, and the sea; others have relation to us, as good and evil, as what is desirable or to be avoided, as pleasant and painful: and since reason has an eye to both of these classes, when it considers the former it is scientific and contemplative, when it considers the latter it is deliberative and practical. And prudence is the virtue in the latter case, as knowledge in the former. And there is this difference between prudence and knowledge, prudence consists in applying the contemplative to the practical and emotional so as to make reason paramount. On which account it often needs the help of fortune; whereas knowledge needs neither the help of fortune nor deliberation to gain its ends: for it considers only things which are always the same. And as the geometrician does not deliberate about the triangle, as to whether its interior angles are together equal to two right angles, for he knows it as a fact—and deliberation only takes place in the case of things which differ at different times, not in the case of things which are certain and unchangeable—so the contemplative mind having its scope in first principles, and things that are fixed, and that ever have one nature which does not admit of change, has no need for deliberation. But prudence, which has to enter into matters full of obscurity and confusion, frequently has to take its chance, and to deliberate about things which are uncertain, and, in carrying the deliberation into practice, has to co-operate with the unreasoning element, which comes to its help, and is involved in its decisions, for they need an impetus. Now this impetus is given to passion by the moral character, an impetus requiring reason to