John Calvin Commentary Titus 2:11

"For the grace of God hath appeared, bringing salvation to all men," — Titus 2:11 (ASV)

For the grace of God has appeared. He argues from the purpose of redemption, which he shows is a desire to live a godly and upright life. Therefore, it follows that the duty of a good teacher is to exhort people to a holy life rather than to occupy their minds with useless questions. He has redeemed us, says Zacharias in his song—

that we may serve him in holiness and righteousness
all the days of our life (Luke 1:74–75).

For the same reason Paul says, the grace of God has appeared, teaching us; for he means that it ought to serve as our instruction for regulating our lives well. What is proclaimed concerning the mercy of God is seized by some as an occasion for licentiousness, while others are hindered by slothfulness from meditating on newness of life. But the manifestation of the grace of God unavoidably brings with it exhortations to a holy life.

Bringing salvation to all men, That it is common to all is expressly stated by him on account of the slaves whom he had mentioned. Yet he does not mean every individual person, but rather describes various classes or ranks of life. And it is quite emphatic that the grace of God has condescended even to slaves; for, since God does not despise people of the lowest and most degraded condition, it would be highly unreasonable for us to be negligent and slothful in embracing His goodness.