Of Each Quasi-integral Part of Prudence

As stated above (Q. 47, AA. 3, 6), prudence applies universal knowledge to particulars which are objects of sense: hence many things belonging to the sensitive faculties are requisite for prudence, and memory is one of them.

Just as aptitude for prudence is in our nature, while its perfection comes through practice or grace, so too, as Tully says in his Rhetoric [Ad Herenn. de Arte Rhet. iii, 16, 24], memory not only arises from nature, but is also aided by art and diligence.

There are four things whereby a man perfects his memory. First, when a man wishes to remember a thing, he should take some suitable yet somewhat unwonted illustration of it, since the unwonted strikes us more, and so makes a greater and stronger impression on the mind; the mind; and this explains why we remember better what we saw when we were children. Now the reason for the necessity of finding these illustrations or images, is that simple and spiritual impressions easily slip from the mind, unless they be tied as it were to some corporeal image, because human knowledge has a greater hold on sensible objects. For this reason memory is assigned to the sensitive part of the soul. Secondly, whatever a man wishes to retain in his memory he must carefully consider and set in order, so that he may pass easily from one memory to another. Hence the Philosopher says (De Memor. et Remin. ii): "Sometimes a place brings memories back to us: the reason being that we pass quickly from the one to the other." Thirdly, we must be anxious and earnest about the things we wish to remember, because the more a thing is impressed on the mind, the less it is liable to slip out of it. Wherefore Tully says in his Rhetoric [Ad Herenn. de Arte Rhet. iii.] that "anxiety preserves the figures of images entire." Fourthly, we should often reflect on the things we wish to remember. Hence the Philosopher says (De Memoria i) that "reflection preserves memories," because as he remarks (De Memoria ii) "custom is a second nature": wherefore when we reflect on a thing frequently, we quickly call it to mind, through passing from one thing to another by a kind of natural order.

It behooves us to argue, as it were, about the future from the past; wherefore memory of the past is necessary in order to take good counsel for the future.

The reasoning of prudence terminates, as in a conclusion, in the particular matter of action, to which, as stated above (Q. 47, AA. 3, 6), it applies the knowledge of some universal principle. Now a singular conclusion is argued from a universal and a singular proposition. Wherefore the reasoning of prudence must proceed from a twofold understanding. The one is cognizant of universals, and this belongs to the understanding which is an intellectual virtue, whereby we know naturally not only speculative principles, but also practical universal principles, such as "One should do evil to no man," as shown above (Q. 47, A. 6). The other understanding, as stated in Ethic. vi, 11, is cognizant of an extreme, i.e. of some primary singular and contingent practical matter, viz. the minor premiss, which must needs be singular in the syllogism of prudence, as stated above (Q. 47, AA. 3, 6). Now this primary singular is some singular end, as stated in the same place. Wherefore the understanding which is a part of prudence is a right estimate of some particular end.

The understanding which is a gift of the Holy Ghost, is a quick insight into divine things, as shown above (Q. 8, AA. 1, 2). It is in another sense that it is accounted a part of prudence, as stated above.

The right estimate about a particular end is called both "understanding," in so far as its object is a principle, and "sense," in so far as its object is a particular. This is what the Philosopher means when he says (Ethic. v, 11): "Of such things we need to have the sense, and this is understanding." But this is to be understood as referring, not to the particular sense whereby we know proper sensibles, but to the interior sense, whereby we judge of a particular.

Although docility is useful for every intellectual virtue, yet it belongs to prudence chiefly, for the reason given above.

Man has a natural aptitude for docility even as for other things connected with prudence. Yet his own efforts count for much towards the attainment of perfect docility: and he must carefully, frequently and reverently apply his mind to the teachings of the learned, neither neglecting them through laziness, nor despising them through pride.

By prudence man makes precepts not only for others, but also for himself, as stated above (Q. 47, A. 12, ad 3). Hence as stated (Ethic. vi, 11), even in subjects, there is place for prudence; to which docility pertains. And yet even the learned should be docile in some respects, since no man is altogether self-sufficient in matters of prudence, as stated above.

Shrewdness is concerned with the discovery of the middle term not only in demonstrative, but also in practical syllogisms, as, for instance, when two men are seen to be friends they are reckoned to be enemies of a third one, as the Philosopher says (Poster. i, 34). In this way shrewdness belongs to prudence.

The Philosopher adduces the true reason (Ethic. vi, 9) to prove that euboulia, i.e. good counsel, is not eustochia, which is commended for grasping quickly what should be done. Now a man may take good counsel, though he be long and slow in so doing, and yet this does not discount the utility of a happy conjecture in taking good counsel: indeed it is sometimes a necessity, when, for instance, something has to be done without warning. It is for this reason that shrewdness is fittingly reckoned a part of prudence.

Rhetoric also reasons about practical matters, wherefore nothing hinders the same thing belonging both to rhetoric and prudence. Nevertheless, conjecture is taken here not only in the sense in which it is employed by rhetoricians, but also as applicable to all matters whatsoever wherein man is said to conjecture the truth.

Reason denotes here, not the power of reason, but its good use.

The certitude of reason comes from the intellect. Yet the need of reason is from a defect in the intellect, since those things in which the intellective power is in full vigor, have no need for reason, for they comprehend the truth by their simple insight, as do God and the angels. On the other hand particular matters of action, wherein prudence guides, are very far from the condition of things intelligible, and so much the farther, as they are less certain and fixed. Thus matters of art, though they are singular, are nevertheless more fixed and certain, wherefore in many of them there is no room for counsel on account of their certitude, as stated in Ethic. iii, 3. Hence, although in certain other intellectual virtues reason is more certain than in prudence, yet prudence above all requires that man be an apt reasoner, so that he may rightly apply universals to particulars, which latter are various and uncertain.

Although intelligence and reason are not different powers, yet they are named after different acts. For intelligence takes its name from being an intimate penetration of the truth [Cf. II-II, Q. 8, A. 1], while reason is so called from being inquisitive and discursive. Hence each is accounted a part of reason as explained above (A. 2; Q. 47, A. 2, 3).

Whenever many things are requisite for a unity, one of them must needs be the principal to which all the others are subordinate. Hence in every whole one part must be formal and predominant, whence the whole has unity. Accordingly foresight is the principal of all the parts of prudence, since whatever else is required for prudence, is necessary precisely that some particular thing may be rightly directed to its end. Hence it is that the very name of prudence is taken from foresight (providentia) as from its principal part.

Speculation is about universal and necessary things, which, in themselves, are not distant, since they are everywhere and always, though they are distant from us, in so far as we fail to know them. Hence foresight does not apply properly to speculative, but only to practical matters.

Right order to an end which is included in the notion of foresight, contains rectitude of counsel, judgment and command, without which no right order to the end is possible.

Though the number of possible circumstances be infinite, the number of actual circumstances is not; and the judgment of reason in matters of action is influenced by things which are few in number.

Circumstances are the concern of prudence, because prudence has to fix them; on the other hand they are the concern of moral virtues, in so far as moral virtues are perfected by the fixing of circumstances.

Just as it belongs to foresight to look on that which is by its nature suitable to an end, so it belongs to circumspection to consider whether it be suitable to the end in view of the circumstances. Now each of these presents a difficulty of its own, and therefore each is reckoned a distinct part of prudence.

Caution is required in moral acts, that we may be on our guard, not against acts of virtue, but against the hindrance of acts of virtue.

It is the same in idea, to ensue good and to avoid the opposite evil, but the avoidance of outward hindrances is different in idea. Hence caution differs from foresight, although they both belong to the one virtue of prudence.

Of the evils which man has to avoid, some are of frequent occurrence; the like can be grasped by reason, and against them caution is directed, either that they may be avoided altogether, or that they may do less harm. Others there are that occur rarely and by chance, and these, since they are infinite in number, cannot be grasped by reason, nor is man able to take precautions against them, although by exercising prudence he is able to prepare against all the surprises of chance, so as to suffer less harm thereby.