(b) An integral whole is one that is not present in all its fullness either of essence or of power in the single parts. This kind of whole is found in a finished composite made up of heterogeneous units, such as a house; for neither walls, nor roof, nor foundation, nor any other single portion of the building is a complete house or has all the uses of a house, but if any one of them is lacking the house is not integral or complete.
(c) A potestative whole is one that is present in all its essence, but not in all its power in each single part. This kind of whole is exemplified in an active principle functioning through diverse faculties, such as the soul which thinks, wills, perceives, accomplishes by means of mind, will, sense, and bodily organs. The soul is present in its entirety in each of these, since it is a simple substance, but in one it exercises one power, in another a different power, in none of them all its powers.
1636. It is customary to speak also of the integral, subjective and potestative parts of a moral virtue. (a) Thus, the quasi-integral parts of a virtue are those functions without which its act is not perfectly performed; and with which it is more perfect. (b) The subjective parts are the species into which the virtue is divided. (e) The quasi-potestative parts are certain subsidiary or annexed virtues which have to do with the secondary acts of a principal virtue, as not having the full efficacy of the latter.
1637. Integral Parts of Prudence.—The integral parts of prudence, considered as a cognitive virtue or as an index of the right means, are those acts which enable one to have knowledge and to acquire knowledge. (a) Thus, the acts requisite for the possession of knowledge about ways and means are the memory of the past and the understanding of the present situation. (b) The acts requisite for the acquisition of new knowledge are docility, by which one learns from others, and quickness of perception, by which one discovers for oneself.
1638. The integral parts of prudence, considered as an operative or a preceptive virtue—that is, as the counsellor and director of life and behavior—are the acts without which one cannot make good use of knowledge as applied to conduct.
(a) Thus, knowledge of general principles must be applied to particular affairs, and this supposes that one knows how to reason correctly, how to infer the particular from the general, how to put facts together. Even those who are not skilled dialecticians have a certain amount of natural logic, and are able to make good use of data or premises in drawing conclusions about their obligations, and thus to make a prudent application of what they know.
(b) Knowledge gained through deliberation has to be effectually made use of; that is, the reason must impose its judgment carefully formed, must determine the line of action to be followed, must properly dispose the means in view of the end. This requires that a person should so direct his future acts as means to the end he has in view that they will be good in themselves (foresight or providence) and in their circumstances (circumspection), and that he will be guarded against external impediments that might hinder him, steering clear of both Scylla and Charybdis (caution): “The prudent man considereth his steps” (Prov., xiv. 15). Examples: Titus wishes to help the poor, and decides on certain methods of raising the money that are dishonest and disedifying. Balbus wishes to induce Caius to go to church, and therefore shows him marks of friendship, not reflecting that these acts of friendship, on account of the character of Caius, will arouse only haughtiness or suspicion. Claudius, in order to practise mortification, resolves on a fast, but also makes up his mind to visit certain friends who will try to make him break his resolution. Sempronius resolves to provide well for his family and also for certain deserving charities, but he fails to insure his property, to invest his money well and to make a will, with the result that neither his family nor the poor are provided for as he had intended. Titus lacked foresight, Balbus was not circumspect, Claudius and Sempronius were incautious.
1639. The Subjective Parts or Species of Prudence.—Prudence in general is the right direction of human actions to their ends; and hence there will be as many different kinds of prudence as there are different kinds of ends of human actions. But the division of ends will be into the particular good of the individual and the common good of the multitude, and thus there are the two species of individual or personal prudence and social prudence.
(a) Individual prudence is the right management of his own acts by the individual, with a view to his personal uprightness.
(b) Social prudence is the right management of the acts of others or of self, with a view to the general welfare of a society.