Commentaries
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.
10. therefore—Greek, "with a view to this." The reason why "we both ('both' is omitted in the oldest manuscripts) labor (endure hardship) and suffer reproach (some oldest manuscripts read 'strive') is because we have rested, and do rest our hope, on the living (and therefore, life-giving, 1Ti 4:8) God."
Saviour—even in this life (1Ti 4:8).
specially of those that believe—Their "labor and reproach" are not inconsistent with their having from the living God, their Saviour, even the present life (Mr 10:30, "a hundred fold now in this time … with persecutions"), much more the life to come. If God is in a sense "Saviour" of unbelievers (1Ti 2:4, that is, is willing to be so everlastingly, and is temporally here their Preserver and Benefactor), much more of believers. He is the Saviour of all men potentially (1Ti 1:15); of believers alone effectually.