(a) Some are taken up entirely with the things of earth, making temporal goods the end of life and the standard of action. These do not keep the Commandments and cannot be saved.
(b) Some use the goods of this world not as ends, but as subordinate to things that are higher. These keep the Commandments and will be saved; but their solicitude about temporal concerns lessens the attention they could give to things of the spirit.
(c) Some renounce entirely the goods of this life, in order to give themselves as completely as possible to the things of God. These observe the counsels, and can more readily attain to holiness and salvation; for, being freed from numerous cares about earthly things, they can devote themselves more easily and earnestly to things that are heavenly.
368. The Three Counsels.—There are many counsels given in the Gospels, but all can be reduced to three, according to the three chief earthly goods that may be surrendered, and the three kinds of temptation that come from those goods.
(a) The counsel of poverty requires that one give up entirely external goods or wealth, from which comes the concupiscence of the eyes: “If thou wilt be perfect, go sell what thou hast, and give to the poor, and thou shalt have treasure in heaven” (Matt, Xix. 21).
(b) The counsel of chastity requires that one renounce entirely carnal goods of pleasure, from which arise the concupiscence of the flesh: “He that giveth his virgin in marriage, doth well; and he that giveth her not, doth better” (I Cor., vii. 38).
(c) The counsel of obedience requires that one deny oneself the good of the soul which is one’s own will, from which comes the pride of life: “Come follow Me” (Matt, xix. 21).
369. The counsels can be followed in two ways. (a) They are followed completely, when one accepts them as a rule for one’s whole life, as is done by those who embrace the state of perfection in the religious life, taking by vow the three evangelical counsels of poverty, chastity and obedience. (b) They are followed partially when one practises them in particular instances. Examples: A wealthy man who gives to the poor when there is no obligation to do so, practises the counsel of poverty in that case. A person who renounces his own legitimate wishes in some matter, practises the counsel of obedience in that case, as when he confers some favor on one who has offended him, or pardons a debt. Married persons who practise conjugal abstinence for the sake of religion, follow a counsel of chastity (I Cor., vii. 5).
Art. 4: HUMAN LAW
(_Summa Theologica_, I-II, qq. 95-97.)