(b) All adults in the state of grace have this virtue both habitually and actually, as far as the need of salvation requires its exercise. Grace enables them either to perceive what they should do to live well, or to seek counsel from the better instructed and to distinguish between good and bad advice.
(c) Some adults in the state of grace have good judgment in a superior degree and are able to direct not only themselves but others, and to deliberate and decide rightly, not only in matters necessary for salvation, but in all kinds of affairs pertaining to the direction of human life.
1655. Can the Acquired Virtue of Prudence Exist in Young People?—(a) If there is question of a formed habit of prudence, the virtue is not in the young, but in those who are advanced in years. Acquired prudence is originated by deliberation on particular cases and by habit, and these are not had without experience and time. Hence, this virtue is to be looked for in the elderly, both because the passions that disturb calm deliberation are no longer so impetuous in them, and because their years have taught them many lessons and given them the opportunity to acquire fixed ways of acting: “In the ancient is wisdom, and in length of days prudence” (Job, xii. 12; cfr. III Kings, xii).
(b) If there is question of a formative prudence, this is found in the young, for they deliberate and decide at times with judgment and firmness, and, if such acts are frequently repeated, they will eventually proceed from a settled moral inclination. It is necessary, therefore, that the moral training of the young begin early, that instruction, counsel and direction be given them by parents and other guides, so that the way of virtue may be made more easy. The young are in duty bound to listen frequently, willingly and reverently to the admonitions of their elders, and hence the modern tendency of youth to act as critics of morals is as foolish as it is presumptuous.
1656. Is There Such a Thing as an Instinctive or Native Prudence?—(a) If we speak of the knowledge of universal principles of right and wrong which are applied by prudence, those principles that are most general are known naturally (i.e., even without instruction or inference), but not so the less general principles that follow from them (see 320 sqq.). Broadly speaking, therefore, one might say that prudence is natural, for in respect of its first principles it has a natural evidence; but it is more correct to say that knowledge of first principles belongs to intuitive reason or understanding, which is also called synteresis in reference to practical truths (see 145), and which is a gift of nature.
(b) If we speak of the particular knowledge of virtuous aims that is presupposed to prudence, one may possess naturally a right judgment about those aims, inasmuch as the right objectives of human life are not variable but determinate, and accordingly may be the centers of attraction to nature, which is drawn to the invariable and determinate, as is seen in irrational creatures. In fact, certain persons are by nature disposed to certain virtues (e.g., temperance), and readily form accurate judgments as to what concerns these virtues. Broadly speaking again, we may say that prudence is natural in the sense that nature disposes some persons to judge rightly about moral ends.
(c) If we speak of the particular knowledge concerning ways and means to fulfill virtuous purposes, there is no natural knowledge of this kind, for the ways and means to moderation are infinitely varied according to the differences of affairs, persons, and circumstances. And since prudence strictly understood is concerned, not with universal principles or the ends of virtues, but with individual cases and the particular means to be employed, it follows that in the strict sense prudence is not natural. But just as we find that some men are better fitted by nature to judge correctly in speculative matters, so also some persons are superior to others in the ability to reason about practical cases and the means conducive to morality.
1657. The Growth and Decay of Prudence.—(a) As repeated acts form a habit of prudence, so do repeated acts strengthen prudence already formed, especially when the chief act of prudence (i.e., the command that things wisely deliberated on be performed) is often brought into play. Even infused prudence is augmented and perfected by use and practice: “Strong meat is for the perfect, for them who by custom have their senses exercised to the discerning of good and evil” (Heb., v. 14).
(b) As prudence consists primarily in a dictate which applies the reason’s knowledge to the control of will and conduct, this virtue is corrupted chiefly by passion. We see that those who are swayed by pleasure or pain lose sight of the true motive of choice and action, and do not issue to themselves the order which prudence and their better judgment inspire. Thus, lust deceived even the elders of the people (Dan., xiii. 56), and bribes blind even the prudent (Exod., xxiii. 8). Nature enables a man to judge rightly about the universal principles of right and wrong; but, when judgment is to be given about particular lines of action, “as a man is, so he judges,” the licentious man judging for pleasure, the cowardly man for neglect of duty. Hence, the moral virtues must be united with prudence, else it perishes.
(c) As prudence presupposes a fund of general moral principles, forgetfulness is an impediment to this virtue; yet not so that every loss of memory which deprives one of arts and sciences will also take away prudence. For, while art and science consist entirely of knowledge, prudence has also a moral element derived from a right inclination of the will towards goodness, and its chief office is the utilization of principles in practice. The virtuous man will continue to follow prudence, even though he has forgotten its theory or rules, guiding himself by good habits formed or by the counsel of those wiser than himself.