Thomas Aquinas, on Gal 3:6

“As it is written: Abraham believed God, and it was reputed to him unto justice.”

“Having proved by experience the power of the faith and the insufficiency of the Law, the Apostle now proves the same things by authority and by reasons. First, he proves the power of the faith to justify; Secondly, in this he proves the insufficiency of the Law (v. 10). The first he proves by using a syllogism. Hence with respect to this he does three things: First, he proves the minor premise; Secondly, the major premise (v. 8); Thirdly, he draws the conclusion (v. 9). Concerning the first, he does two things: First, he proposes a certain authority from which he takes the minor; Secondly, he concludes the minor (v. 7). He says therefore: Truly, justice and the Holy Spirit come from faith, "As it is written" in Genesis (15:6) and mentioned again in Romans (4:3): "Abraham believed God and it was reputed to him unto justice." Here it should be noted that justice consists in paying a debt. Now man is indebted to God and to himself and to his neighbor. But it is on account of God that he owes something to himself and his neighbor. Therefore the highest form of justice is to render to God what is God's. For if you render to yourself or your neighbor what you owe and do not do this for the sake of God, you are more perverse than just, since you are putting your end in man. Now, whatever is in man is from God, namely, intellect and will and the body itself, albeit according to a certain order; because the lower is ordained to the higher, and external things to internal, namely, to the good of the soul. Furthermore, the highest thing in man is his mind. Therefore the first element of justice in a man is that a man's mind be subjected to God, and this is done by faith: "Bringing into captivity every understanding unto the obedience of Christ" (2 Cor 10:5). Therefore in all things it must be said that God is the first principle in justice and that whosoever gives to God, namely, the greatest thing that lies in him by submitting the mind to Him, such a one is fully just: "Whosoever are led by the Spirit of God, they are the sons of God" (Rom 8:14). And hence he says, Abraham believed God, i.e., submitted his mind to God by faith: "Believe God, and he will recover thee: and direct thy way, and trust in him" (Sir 2:6); and further on (2:8): "Ye that fear the Lord believe him," "and it was reputed to him unto justice," i.e., the act of faith and faith itself were for him, as for everyone else, the sufficient cause of justice. It is reputed to him unto justice by men exteriorly, but interiorly it is wrought by God, Who justifies them that have the faith. This he does by remitting their sins through charity working in them.”

Imported from an open dataset — not yet checked against the printed edition.