Thomas Aquinas

“ On the other hand the Divine law directed men to one another according to the demands of that order whereby man is directed to God, which order was the chief aim of that law. Now man is directed to God not only by the interior acts of the mind, which are faith, hope, and love, but also by certain external works, whereby man makes profession of his subjection to God: and it is these works that are said to belong to the Divine worship. ”

“ 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. ”

“ Therefore besides the moral precepts there are others which are ceremonial.
I answer that, As stated above (A [2] ) , the Divine law is instituted chiefly in order to direct men to God; while human law is instituted chiefly in order to direct men in relation to one another. Hence human laws have not concerned themselves with the institution of anything relating to Divine worship except as affecting the common good of mankind: and for this reason they have devised many institutions relating to Divine matters, according as it seemed expedient for the formation of human morals ”

“ Covetousness whereby man places his end in temporalities, is the bane of charity. But the attainment of temporal goods which man desires in subordination to God is a road leading the imperfect to the love of God, according to Ps. 48:19: "He will praise Thee, when Thou shalt do well to him."
Reply to Objection 2: Human law persuades men by means of temporal rewards or punishments to be inflicted by men: whereas the Divine law persuades men by meas of rewards or punishments to be received from God. ”

“ Duty as fixed by the Law, belongs to the judicial precepts, as regards human affairs; to the "ceremonial" precepts, as regards Divine matters.
Nevertheless those ordinances also which refer to punishments and rewards may be called "testimonies," in so far as they testify to the Divine justice. Again all the precepts of the Law may be styled "justifications," as being executions of legal justice. Furthermore the commandments may be distinguished from the precepts, so that those things be called "precepts" which God Himself prescribed ”

“ 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.
Art. 2 - Whether the Old Law contains moral precepts? Objection 1: It would seem that the Old Law contains no moral precepts. ”

“ Now it is to be observed that, in speculative sciences, the means of persuasion are adapted to the conditions of the pupil: wherefore the process of argument in sciences should be ordered becomingly, so that the instruction is based on principles more generally known. ”

“ This worship is called "ceremony" [the munia, i.e. gifts] of Ceres (who was the goddess of fruits) , as some say: because, at first, offerings were made to God from the fruits: or because, as Valerius Maximus states [*Fact. et Dict. Memor. i, 1] , the word "ceremony" was introduced among the Latins, to signify the Divine worship, being derived from a town near Rome called "Caere": since, when Rome was taken by the Gauls, the sacred chattels of the Romans were taken thither and most carefully preserved. ”

“ And thus also he who would persuade a man to the observance of any precepts, needs to move him at first by things for which he has an affection; just as children are induced to do something, by means of little childish gifts. ”