Titus 2:11

Here we have the grounds or considerations upon which all the foregoing directions are urged, taken from the nature and design of the gospel, and the end of Christ's death. I. From the nature and design of the gospel. Let young and old, men and women, masters and servants, and Titus himself, let all sorts do their respective duties, for this is the very aim and business of Christianity, to instruct, and help, and form persons, under all distinctions and relations, to a right frame and conduct. For this, 1. They are put under the dispensation of the grace of God, so the gospel is called, Eph 3:2. It is grace in respect of the spring of it - the free favour and good-will of God, not any merit or desert in the creature; as manifesting and declaring this good-will in an eminent and signal manner; and as it is the means of conveying and working grace in the hearts of believers. Now grace is obliging and constraining to goodness: Let not sin reign, but yield yourselves unto God; for you are not under the law, but under grace, Rom 6:12-14. The love of Christ constrains us not to live to self, but to him (Co2 5:14, Co2 5:15); without this effect, grace is received in vain. 2. This gospel grace brings salvation (reveals and offers it to sinners and ensures it to believers) - salvation from sin and wrath, from death and hell.

— Matthew Henry's Concise Commentary (public domain)

the grace of God--God's gratuitous favor in the scheme of redemption. hath appeared--Greek, "hath been made to appear," or "shine forth" (Isa 9:2; Luk 1:79). "hath been manifested" (Tit 3:4), after having been long hidden in the loving counsels of God (Col 1:26; Ti2 1:9-10). The image is illustrated in Act 27:20. The grace of God hath now been embodied in Jesus, the brightness of the Father's glory," manifested as the "Sun of righteousness," "the Word made flesh." The Gospel dispensation is hence termed "the day" (Th1 5:5, Th1 5:8; there is a double "appearing," that of "grace" here, that of "glory," Tit 2:13; compare Rom 13:12). Connect it not as English Version, but, "The grace . . . that bringeth salvation to all men hath appeared," or "been manifested" (Ti1 2:4; Ti1 4:10). Hence God is called "our Saviour" (Tit 2:10). The very name Jesus means the same. to all--of whom he enumerated the different classes (Tit 2:2-9): even to servants; to us Gentiles, once aliens from God. Hence arises our obligation to all men (Tit 3:2).

— Jamieson-Fausset-Brown Commentary (public domain)