Section V.--_of Cardinal Virtues_.

1. The enumeration of cardinal virtues is a piece of Greek philosophy that has found its ways into the catechism. Prudence, justice, fortitude, and temperance are mentioned by Plato as recognised heads of virtue. They are recognised, though less clearly, by Xenophon, reporting the conversations of Socrates. It does not look as though Socrates invented the division: he seems to have received it from an earlier source, possibly Pythagoras. They are mentioned in Holy Scripture (Wisdom viii., 7, which is however a Greek book), and Proverbs viii., 14. They make no figure in the philosophies of India and China.

2. The cardinal virtues are thus made out.--Virtue is a habit that gives a man readiness in behaving according to the reason that is in him. Such a habit may be fourfold. (a) It may reside in the reason, or intellect itself, enabling it readily to discern the reasonable thing to do, according to particular circumstances as they occur. That habit is the virtue of prudence. (b) It may reside in the rational appetite, otherwise called the will, disposing a man to act fairly and reasonably in his dealings with other men. That is justice. (c) It may reside in the irrational, or sensitive, appetite, and that to a twofold purpose; (a) to restrain the said appetite in its concupiscible part from a wanton and immoderate eagerness after pleasure; that is temperance: (b) to incite the said appetite in its irascible part not to shrink from danger, where there is reason for going on in spite of danger; that is fortitude.

3. Plato compares the rational soul in man to a charioteer, driving two horses: one horse representing the concupiscible, the other the irascible part of the sensitive appetite. He draws a vivid picture of the resistance of the concupiscible part against reason, how madly it rushes after lawless pleasure, and how it is only kept in restraint by main force again and again applied, till gradually it grows submissive. This submissiveness, gradually acquired, is the virtue of temperance. Clearly the habit dwells in the appetite, not in reason: in the horse, not in the charioteer. It is that habitual state, which in a horse we call being broken in.

The concupiscible appetite is broken in to reason by temperance residing within it. Plato lavishes all evil names on the steed that represents the concupiscible part. But the irascible part, the other steed, has its own fault, and that fault twofold, sometimes of over-venturesomeness, sometimes of shying and turning tail. The habit engendered, in the irascible part, of being neither over-venturesome nor over-timorous, but going by reason, is termed fortitude. [Footnote 6]

4. As the will is the rational appetite, the proper object of which is rational good, it does not need to be prompted by any habit to embrace rational good in what concerns only the inward administration of the agent's own self. There is no difficulty in that department, provided the sensitive appetite be kept in hand by fortitude and temperance. But where there is question of external relations with other men, it is not enough that the sensitive appetite be regulated, but a third virtue is necessary, the habit of justice, to be planted in the will, which would otherwise be too weak to attend steadily to points, not of the agent's own good merely, but of the good of other men.

5. Thus we have the four cardinal virtues: prudence, a habit of the intellect; temperance, a habit of the concupiscible appetite; fortitude, a habit of the irascible appetite; and justice, a habit of the will. Temperance and Fortitude in the Home Department; Justice for Foreign Affairs; with Prudence for Premier. Or, to use another comparison, borrowed from Plato, prudence is the health of the soul, temperance its beauty, fortitude its strength, and justice its wealth.

Readings.--St. Thos., 1a 2æ, q. 61, art. 2, in corp.; ib., q. 56, art. 4, in corp., ad 1-3; ib., q. 56, art. 6, in corp., ad 1, 3; ib., q. 59, art. 4, in corp., ad 2; Plato, Laws, 631 B, C.