6 If thou put the brethren in mind of these things, thou shalt be a good minister of Christ Jesus, nourished in the words of the faith, and of the good doctrine which thou hast followed [until now]: 7 but refuse profane and old wives' fables. And exercise thyself unto godliness: 8 for bodily exercise is profitable for a little; but godliness is profitable for all things, having promise of the life which now is, and of that which is to come.
Matthew Henry's Commentary on 1 Timothy 4:6-8
Commentary on 1 Timothy 4:6-10
(Read 1 Timothy 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.