1549. Though charity is but one virtue (see 1115), it has two acts: one about love of God, which is the end, and another about love of neighbor, which is a means to that end.
(a) If all understood that the end includes the means and the means supposes the end, there would be no necessity for two distinct commandments; for there is no love of God without love of neighbor (I John, iv. 20), and he who loves his neighbor has fulfilled the law (Rom., xiii. 8).
(b) But since many would not perceive that one of the commandments of charity contains the other, it was necessary to propose these commandments separately: “We have this command from God that he who loves God love also his brother” (I John, iv. 21).
1550. Charity extends to other objects than God and the neighbor, namely, to self and one’s own body (see 1133 sqq.); it also has other acts than that of love, such as the acts of joy, peace, beneficence (see 1193 sqq.), and the suppression of uncharitable hatred, sloth, envy (see 1295 sqq.), etc. Nevertheless, on the two commandments of love of God and love of neighbor depend the whole law and the prophets (Matt., xxii. 40), and other commandments about charity are not necessary.
(a) Thus, the objects of love are either the end or the means to the end, and, as the two commandments of charity refer to both of these, they omit nothing that is to be loved. It was not necessary to make express command of love of self, for nature inclines to that sufficiently, and the duty of keeping love of self within bounds is provided for in the commandments that God be loved above all and the neighbor as oneself.
(b) The acts of charity distinct from love result from love, and the acts opposed to charity are virtually forbidden in the commandments of their opposites. Hence, there was no need of explicit precepts about the secondary acts of charity or of explicit prohibitions of the sins against charity. But for the sake of those who might not perceive that the minor functions of charity are commanded and acts of uncharitableness forbidden in the two great commandments, special and explicit laws were given which enjoin peace, joy, etc., and forbid hatred, envy, etc.
1551. The precepts of the secondary acts of charity are: (a) joy: “Rejoice in the Lord always” (Phillip., iv. 4); (b) peace: “Follow peace with all men” (Heb., xii. 14); and (c) beneficence: “While we have time, let us do good to all” (Gal., vi. 10).
1552. The prohibitions of uncharitableness are as follows: (a) against hatred: “Thou shalt not hate thy brother in thy heart” (Lev, xix. IT); (b) against sloth: “Bow down thy shoulder and hear her (wisdom), and be not grieved with her bands” (Ecclus., vi. 26); (c) against envy: “Let us not be made desirous of vainglory, provoking one another, envying one another” (Gal., v. 26), (d) against discord: “Speak the same things and let there be no schisms among you” (I Cor., i. 10); and (e) against scandal: “Put not a stumbling-block or a scandal in your brother’s way” (Rom., xiv. 13).
1553. The Commandment of Love of God.—In the commandment of love of God two things are expressed: (a) the matter of the commandment is God, the object of love; (b) the manner of the commandment is that God be loved as the Last End, to whose love all other love is to be subordinated.
1554. There is a twofold manner or mode of performing a virtuous act: