ne's neighbor includes love of God,
when we love our neighbor for God's sake. Hence the Apostle put this
commandment in place of the two which are about the love of God and
of one's neighbor, and of which Our Lord said (Matt. 22:40): "On
these two commandments dependeth the whole Law and the prophets."

Reply Obj. 3: As stated in _Ethic._ ix, 8, "friendship towards
another arises from friendship towards oneself," in so far as man
looks on another as on himself. Hence when it is said, "All things
whatsoever you would that men should do to you, do you also to them,"
this is an explanation of the rule of neighborly love contained
implicitly in the words, "Thou shalt love thy neighbor as thyself":
so that it is an explanation of this commandment.
________________________

SECOND ARTICLE [I-II, Q. 99, Art. 2]

Whether the Old Law Contains Moral Precepts?

Objection 1: It would seem that the Old Law contains no moral
precepts. For the Old Law is distinct from the law of nature, as
stated above (Q. 91, AA. 4, 5; Q. 98, A. 5). But the moral precepts
belong to the law of nature. Therefore they do not belong to the Old
Law.

Obj. 2: Further, the Divine Law should have come to man's assistance
where human reason fails him: as is evident in regard to things that
are of faith, which are above reason. But man's reason seems to
suffice for the moral precepts. Therefore the moral precepts do not
belong to the Old Law, which is a Divine law.

Obj. 3: Further, the Old Law is said to be "the letter that killeth"
(2 Cor. 3:6). But the moral precepts do not kill, but quicken,
according to Ps. 118:93: "Thy justifications I will never forget, for
by them Thou hast given me life." Therefore the moral precepts do not
belong to the Old Law.

_On the contrary,_ It is written (Ecclus. 17:9): "Moreover, He gave
them discipline [Douay: 'instructions'] and the law of life for an
inheritance." Now discipline belongs to morals; for this gloss on
Heb. 12:11: "Now all chastisement (_disciplina_)," etc., says:
"Discipline is an exercise in morals by means of difficulties."
Therefore the Law which was given by God comprised moral precepts.

_I answer that,_ The Old Law contained some moral precepts; as is
evident from Ex. 20:13, 15: "Thou shalt not kill," "Thou shalt not
steal." This was reasonable: because, just as the principal intention
of human law is to create friendship between man and man; so the
chief intention of the Divine law is to es