(9) This is a faithful saying and worthy of all acceptation.--Again we have the striking formula which always calls attention to some great truth which, in the Church of the first days, had already obtained among the congregations a broad, if not a universal currency, as one of the great watchwords of the faith. Now we find one of these taken apparently from a Christian hymn, now from one of the public prayers or thanksgivings. The "faithful saying," in this instance, was that "godliness," that is, "active, living piety," is profitable for all things, seeing it has the promise of the life that now is and of that which is to come.
Verse 9. - Faithful is the saying for this is a faithful saying, A.V. (1 Timothy 1:15, note). Here, however, the πιστὸς λόγος is that which precedes, viz. that "godliness is profitable for all things," etc., which we thus learn was a proverbial saying.
4:6-10 Outward acts of self-denial profit little. What will it avail us to mortify the body, if we do not mortify sin? No diligence in mere outward things could be of much use. The gain of godliness lies much in the promise; and the promises to godly people relate partly to the life that now is, but especially to the life which is to come: though we lose for Christ, we shall not lose by him. If Christ be thus the Saviour of all men, then much more will he be the Rewarder of those who seek and serve him; he will provide well for those whom he has made new creatures.
and worthy of all acceptation; by all godly persons, to encourage them to the exercise of godliness.