John Gill's Exposition of the Whole Bible
Job 17:9
The righteous also shall hold on his way,.... He that is righteous, not in appearance but really, not in a legal but in an evangelic sense; who is justified by the righteousness of Job's living Redeemer, who lives by faith on his righteousness, and in consequence of that in holiness of life and conversation; such an one being in Christ the way of righteousness and salvation, and walking in the paths of faith, holiness, and truth, and in all the tracks of religious worship, private and public, he will persevere therein, and will not on any account depart out of the right way into which he has been led and directed. This is opposed to a going back, as some do, and to a turning to the right hand or the left, as others, and to a standing still, being stumbled, offended, and discouraged; and it supposes a progress, a going forward in the way, so as not to be moved out of it by their own, or the afflictions of others, by the reproaches and persecutions of men, the temptations of Satan, the snares, riches, honours, and pleasures of the world, or through darkness, desertion, and unbelief; they may indeed have many slips and falls, and be almost, but not altogether, out of the way, and never finally or to perdition; which is owing not to their conduct and care, might and strength, but to the power of God, and the supplies of his grace, to Christ and his strength, and to the Spirit and his influence, guidance, and direction:
and he that hath clean hands shall be stronger and stronger; or "add strength" u; increase in it. This character is opposed to one of an immoral life and conversation, and describes one that is not guilty of any notorious crime, that does not live in any known sin, but in the general course of his life is upright and sincere, holy, harmless, and inoffensive; such a man as he is already a partaker of spiritual grace and strength, and so, as he wants more, it is given him; his spiritual strength is renewed, he goes from one degree of it to another, and even while walking in the way of God he finds an increase of it; yea, that itself is strength unto him; as his day is his strength is, to assist him in religious services, to enable him to resist his enemies, and endure afflictions, and continue in the good ways of God.
u יסיף אמץ "addet fortitudinem", Pagninus, Montanus.