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.

8. profiteth little—Greek, "profiteth to (but) a small extent." Paul does not deny that fasting and abstinence from conjugal intercourse for a time, with a view to reaching the inward man through the outward, do profit somewhat, Ac 13:3; 1Co 7:5, 7; 9:26, 27 (though in its degenerate form, asceticism, dwelling solely on what is outward, 1Ti 4:3, is not only not profitable but injurious). Timothy seems to have had a leaning to such outward self-discipline (compare 1Ti 5:23). Paul, therefore, while not disapproving of this in its due proportion and place, shows the vast superiority of godliness or piety, as being profitable not merely "to a small extent," but unto all things; for, having its seat within, it extends thence to the whole outward life of a man. Not unto one portion only of his being, but to every portion of it, bodily and spiritual, temporal and eternal [Alford]. "He who has piety (which is 'profitable unto all things') wants nothing needed to his well-being, even though he be without those helps which, 'to a small extent,' bodily exercise furnishes" [Calvin]. "Piety," which is the end for which thou art to "exercise thyself" (1Ti 4:7), is the essential thing: the means are secondary.

having promise, &c.—Translate as Greek, "Having promise of life, that which now is, and that which is to come." "Life" in its truest and best sense now and hereafter (2Ti 1:1). Length of life now so far as it is really good for the believer; life in its truest enjoyments and employments now, and life blessed and eternal hereafter (Mt 6:33; Mr 10:29, 30). "Now in this time" (Ps 84:11; 112:1-10; Ro 8:28; 1Co 3:21, 22, "all things are yours … the world, life … things present, things to come"). Christianity, which seems to aim only at our happiness hereafter, effectually promotes it here (1Ti 6:6; 2Pe 1:3). Compare Solomon's prayer and the answer (1Ki 3:7-13).