1 Timothy 1:15

“This is a faithful saying, and worthy of all acceptation, etc.] This is said, lest it should be thought strange, or scarcely credible, that so great a sinner should be saved; as well as to give a summary of the glorious Gospel the apostle was intrusted with; and in opposition to fables, endless genealogies, and vain jangling, and contentions about the law. The doctrine of Christ's coming into the world, and of salvation by him, as it is the sum and substance of the Gospel, so it is a “faithful saying”; in which the faithfulness of God is displayed to himself, and the perfections of his nature, his holiness, justice, love, grace, and mercy; to his law, which is magnified, and made honourable;…”

“faithful--worthy of credit, because "God" who says it "is faithful" to His word (Co1 1:9; Th1 5:24; Th2 3:3; Rev 21:5; Rev 22:6). This seems to have become an axiomatic saying among Christians the phrase, "faithful saying," is peculiar to the Pastoral Epistles (Ti1 2:11; Ti1 4:9; Tit 3:8). Translate as Greek, "Faithful is the saying." all--all possible; full; to be received by all, and with all the faculties of the soul, mind, and heart. Paul, unlike the false teachers (Ti1 1:7), understands what he is saying, and whereof he affirms; and by his simplicity of style and subject, setting forth the grand fundamental truth of salvation through Christ, confutes the false teachers' abstruse and…”

“This is a faithful saying - Greek, “Faithful is the word,” or doctrine - ὁ λογος ho logos. This verse has somewhat the character of a parenthesis, and seems to have been thrown into the midst of the narrative because the mind of the apostle was full of the subject. He had said that he, a great sinner, had obtained mercy. This naturally led him to think of the purpose for which Christ came into the world - to save sinners - and to think how strikingly that truth had been illustrated in his own case, and how that case had shown that it was worthy the attention of all. The word rendered “saying,” means in this place doctrine, position, or declaration. The word “faithful,” means assuredly true;…”

“This is a faithful saying - A most solemn preface. And worthy of all acceptation - Well deserving to be accepted, received, embraced, with all the faculties of our whole soul. That Christ - Promised. Jesus - Exhibited. Came into the world to save sinners - All sinners, without exception. 1 Timothy 1:16”

“1:15 This is a trustworthy saying: This expression occurs only in the letters to Timothy and Titus (1 Tim 3:1; 4:8-9; 2 Tim 2:11-13; Titus 3:4-8). These sayings are probably quotations from tradition that Paul has adapted to the current situation; here, in addition to the way the saying underscores the mercy shown to Paul, it probably corrects the false teachers. The emphasis of this saying falls on Christ’s entrance into history for the salvation of sinners, which was probably being marginalized by the false teachers, who emphasized law (1 Tim 1:7), special knowledge (6:20; cp. Titus 1:16), and stipulations such as those in 1 Tim 4:3 (cp. Col 2:16-23).”

“a faithful: Ti1 1:19, Ti1 3:1, Ti1 4:9; Ti2 2:11; Tit 3:8; Rev 21:5, Rev 22:6 worthy: Joh 1:12, Joh 3:16, Joh 3:17, Joh 3:36; Act 11:1, Act 11:18; Jo1 5:11 that: Mat 1:21, Mat 9:13, Mat 18:11, Mat 20:28; Mar 2:17; Luk 5:32, Luk 19:10; Joh 1:29, Joh 12:47; Act 3:26; Rom 3:24-26, Rom 5:6, Rom 5:8-10; Heb 7:25; Jo1 3:5, Jo1 3:8, Jo1 4:9, Jo1 4:10; Rev 5:9 of whom: Ti1 1:13; Job 42:6; Eze 16:63, Eze 36:31, Eze 36:32; Co1 15:9; Eph 3:8 1 Timothy 1:16”