2 Corinthians 10:17-18
Brethren, he that glorieth, let him glory in the Lord. For not he who commandeth himself is approved: but he whom God commandeth. Would to God you could bear with some little of my folly, but do bear with me: for I am jealous of you with the jealousy of God. For I have espoused you to one husband, that I may present you as a chaste virgin to Christ.
Denzinger
810: The Fruit of Justification, that is, the Merit of Good Works, and the Reasonableness of that Merit
Council of Trent SESSION VI (Jan. 13, 1547) Decree On Justification
Nor indeed is this to be omitted, that although in the sacred Writings so much is ascribed to good works, that even “he that shall give a drink of cold water to one of his least ones” Christ promises “shall not lose his reward” [Matt. 10:42], and the Apostle testifies “that that which is at present momentary and light of our tribulation, worketh for us above measure exceedingly an eternal weight of glory” [2 Cor. 4:17]; nevertheless far be it that a Christian should either trust or “glory” in himself and not “in the Lord” [cf. 1 Cor. 1:31; 2 Cor. 10:17], whose goodness towards all men is so great that He wishes the things which are His gifts [see n. 141] to be their own merits [can. 32]. And whereas “in many things we all offend” [Jas. 3:2; can. 23], each one should have before his eyes the severity and judgment as well as mercy and goodness; neither ought anyone to judge himself, even though he be “not conscious to himself of anything,” since the whole life of men must be judged and examined not by the judgment of men, but of God, who “will bring to light the hidden things of darkness, and will make manifest the counsels of the hearts, and then shall every man have praise from God” [1 Cor.4:4ff.], “who,” as it is written, “will render to every man according to his works” [Rom. 2:6].
After this Catholic doctrine of justification [can. 33]–which, unless he faithfully and firmly accepts it, no one can be justified–it seemed good to the holy Synod to add these canons, so that all may know, not only what they must hold and follow, but also what they ought to shun and avoid.
904: The Necessity and Fruit of Satisfaction
JULIUS III 1550-1555 COUNCIL OF TRENT SESSION XIII (Oct. II, 1551) Decree On the Most Holy Eucharist
Finally with regard to satisfaction, which of all the parts of penance has been recommended by our Fathers to the Christian people in all ages, and which is especially assailed in our day under the pretext of piety by those who “have an appearance of piety, but who have denied the power thereof” [2 Tim. 3:51], the holy Synod declares that it is absolutely false and contrary to the word of God that the guilt is never forgiven by the Lord without the entire punishment also being remitted [can. 12, 15]. For clear and illustrious examples are found in the Sacred Writings [cf. Gen. 3:16 f.; Num. 12:14 f.; 20:11 f.; 2 Samuel 12:13]. f., etc.], besides which divine tradition refutes this error with all possible clarity. Indeed the nature of divine justice seems to demand that those who have sinned through ignorance before baptism may be received into grace in one manner, and in another those who at one time freed from the servitude of sin and the devil, and on receiving the gift of the Holy Spirit, did not fear to “violate the temple of God knowingly” [1 Cor. 3:17], “and to grieve the Holy Spirit” [Eph. 4:30]. And it befits divine clemency that sins be not thus pardoned us without any satisfaction, lest, seizing the occasion [Rom. 7:8], and considering sins trivial, we, offering injury and “affront to the Holy Spirit” [Heb. 10:29], fall into graver ones, “treasuring up to ourselves wrath against the day of wrath” [Rom. 2:5; Jas. 5:3]. For, without doubt, these satisfactions greatly restrain from sin, and as by a kind of rein act as a check, and make penitents more cautious and vigilant in the future; they also remove the remnants Of sin, and destroy vicious habits acquired by living evilly through acts contrary to virtue. Neither was there ever in the Church of God any way considered more secure for warding off impending punishment by the Lord than that men perform these works of penance [Matt. 3:28;4:17;11:21 etc.] with true sorrow of soul. Add to this that, while we suffer by making satisfaction for our sins, we are made conformable to Christ Jesus, “who made satisfaction for our sins” [Rom. 5:10; 1 John 2:1 f.], from whom is all our sufficiency [2 Cor. 3:5], having also a most certain pledge from Him that “if we suffer with Him, we shall also be glorified” [cf. Rom. 8:17]. Neither is this satisfaction which we discharge for our sins so much our own as it is through Jesus Christ; for we who can do nothing of ourselves, as if of ourselves, with the cooperation “of Him who” comforts us, “we can do all things.” Thus man has not wherein to glory; but all “our glorying” [cf. 1 Cor. 1:31; 2 Cor. 10:17; Gal. 6:14] is in Christ, “in whom we live, in whom we move” [cf. Acts 17:28], in whom we make satisfaction, “bringing forth fruits worthy of penance” [Luke 3:8] which have their efficacy from Him, by Him are offered to the Father, and through Him are accepted by the Father [can. 13 f.].