25 If sometime God grant to them repentance This expression, “If sometime,” or “If perhaps,” points out the difficulty of the case, as being nearly desperate or beyond hope. Paul therefore means that even towards the most unworthy we must exercise meekness; and although at first there be no appearance of having gained advantage, still we must make the attempt. For the same reason he mentions that “God will grant it.” Since the conversion of a man is in the hand of God, who knows whether they who today appear to be unteachable shall be suddenly changed by the power of God, into other men? Thus, whoever shall consider that repentance is the gift and work of God, will cherish more earnest hope, and, encouraged by this confidence, will bestow more toil and exertion for the instruction of rebels. We should view it thus, that our duty is, to be employed in sowing and watering, and, while we do this, we must look for the increase from God. (1 Corinthians 3:6.) Our labors and exertions are thus of no advantage in themselves; and yet, through the grace of God, they are not fruitless.
To the knowledge of the truth We may learn from this what is the actual repentance of those who for a time were disobedient to God; for Paul declares that it begins with “the knowledge of the truth.” By this he means that the understanding of man is blinded, so long as it stands out fiercely against God and his doctrine.