1265–1273 · Thomas Aquinas, Summa Theologica II-II, q. 16, a. 1, co.
I answer that, A master does not impose laws on others than his subjects; wherefore the precepts of a law presuppose that everyone who receives the law is subject to the giver of the law. Now the primary subjection of man to God is by faith, according to Heb. 11:6: "He that cometh to God, must believe that He is." Hence faith is presupposed to the precepts of the Law: for which reason (Ex. 20:2) that which is of faith, is set down before the legal precepts, in the words, "I am the Lord thy God, Who brought thee out of the land of Egypt," and, likewise (Dt. 6:4), the words, "Hear, O Israel, the Lord thy [Vulg.: 'our'] God is one," precede the recording of the precepts.