You shall fear the LORD your God, and serve him, and shall swear by his name.
All Commentaries on Deuteronomy 6:13 Go To Deuteronomy 6
Augustine of Hippo
AD 430
What is to be said of justice in its relation to God? As the Lord says, “No man can serve two masters,” and the apostle rebukes those who serve the creature rather than the Creator, so had it not been said before in the Old Testament: “You shall adore the Lord your God and him only shall you serve”? But what need is there to say more about this here since the Scriptures are full of such texts? Justice then offers this rule of life to the lover we are describing: that he serve with gladness the Lord whom he loves, that is to say, the supreme good, the supreme wisdom, the supreme peace; and with respect to all other things, that he govern those which are subject to him and endeavor to subject all else to the same rule. This rule of life is confirmed, as we have shown, by the authority of both Testaments. .