Matthew Poole and continuators on Galatians 6:9

9 And let us not be weary in well doing : for in due season, we shall reap if we faint not .

We have the same precept, 2 Thessalonians 3.13. As the not executing of jugdement speedily imboldens sinners, and encourageth them to go on in courses of sin, so Gods delaying the rewards of the righteous, often proveth a temptation to good men to be weary of well doing. Against this the Apostle cautioneth us here.

By minding us, that there is a due season for all things, (which is best known to the wise God:) and assuring us that though as we see not the Husbandman presently reaping assoon as he hath sown, but waiting patiently in hope, that in a due season he shall reap, so we, though we be not presently rewarded, yet in Gods season shall as certainly reap as he doth. But he also mindeth us, that if we will reap we must not faint, but go on and persevere in our course of well doing: otherwise we can no more expect to reap, then the husbandman can that hath sown well, but out of impatience before the time cometh for him to reap, shall go and plow up again all that he hath sown, Ezek. 33 13.