Romans 6:19-23
Brethren: I speak a human thing, because of the infirmity of your flesh; for as you have yielded your members to serve uncleanness and iniquity unto iniquity, so now yield your members to serve justice unto sanctification. For when you were the servants of sin, you were free from justice. What fruit therefore had you then in those things, of which you are now ashamed? For the end of them is death. But now being made free from sin, and become servants to God, you have your fruit unto sanctification, and the end life everlasting. For the wages of sin is death. But the grace of God is life everlasting; in Christ Jesus our Lord.
Haydock
Verse 19. I speak a human thing, or I am proposing to you what is according to human strength and ability assisted by the grace of God, with a due regard to the weakness and infirmity of your flesh. The sense, according to S. Chrys. is this, that the apostle having told them they must be dead to sin, lead a new life, &c. he now encourages them to it, by telling them, that what is required of them is not above their human strength, as it is assisted by those graces which God offers them, and which they have received. Where we may observe that these words, I speak a human thing, are not the same, nor to be taken in the same sense, as cap. iii. 6. when he said, I speak after a human way, or I speak like men. Wi. — What I ask of you, Christian Romans, is, that you so earnestly labour for your sanctification as to improve daily in virtue, as formerly you plunged every day deeper and deeper into vice. Menochius.
Verse 20-22. You were free from justice; that is, says S. Chrys. you lived as no ways subject to justice, nor obedient to the law and precepts of God: an unhappy freedom, a miserable liberty, worse than the greatest slavery, the end of which is death, eternal death: of which sins with great reason you are now ashamed, when you are become the servants of God, and obedient to him, for which you will receive the fruit and reward of everlasting life in heaven. Wi.
Verse 23. For the wages, which the tyrant sin gives to his soldiers and slaves, is eternal death; but the wages, the pay, the reward, which God gives to those that fight under him, is everlasting life; which, though a reward of our past labours, as it is often called in the Scriptures, is still a grace, or free gift; because if our works are good, or deserve a reward in heaven, it is God’s grace that makes them deserve it. For, as S. Aug. says, when God crowns our works, he crowns his own gifts. Wi.
Denzinger
803: Concerning the Increase of Justification Received
Council of Trent SESSION VI (Jan. 13, 1547) Decree On Justification Chapter 10
Having, therefore, been thus justified and having been made the “friends of God” and “his domestics” [John 15:15; Eph. 2:19], “advancing from virtue to virtue” [Ps. 83:8], “they are renewed” (as the Apostle says) “from day to day” [2 Cor. 4:16], that is, by mortifying the members of their flesh [Col. 3:5], and by “presenting them as instruments of justice” [Rom. 6:13, 19], unto sanctification through the observance of the commandments of God and of the Church; in this justice received through the grace of Christ “faith cooperating with good works” [Jas. 2:22], they increase and are further justified [can. 24 and 32], as it is written: “He that is just, let him be justified still” [Rev. 22:11], and again: “Be not afraid to be justified even to death” [Sirach. 18:22], and again: “You see, that by works a man is justified and not by faith only” [Jas. 2:24]. And this increase of justice Holy Church begs for, when she prays: “Give unto us, O Lord, an increase of faith, hope and charity” [13th Sun. after Pent.].
793: On the Inability of Nature and of the Law to Justify Man
Council of Trent SESSION VI (Jan. 13, 1547) Decree On Justification Chapter 1
The holy Synod decrees first that for a correct and sound understanding of the doctrine of justification it is necessary that each one recognize and confess that, whereas all men had lost their innocence in the prevarication of Adam [Rom. 5:12; 1 Cor. 15:22: see n. 130], “having become unclean” [Isa. 64:6], and (as the Apostle says), “by nature children of wrath” [Eph. 2:3], as it (the Synod) has set forth in the decree on original sin, to that extent were they the servants of sin [Rom. 5:20], and under the power of the devil and of death, that not only the gentiles by the force of nature [can. 1], but not even the Jews by the very letter of the law of Moses were able to be liberated or to rise therefrom, although free will was not extinguished in them [can. 5], however weakened and debased in its powers [see n. 81].