Brothers, let me put this in human terms. Even a human covenant, once it is ratified, cannot be canceled or amended.
15. I speak after the manner of men. By this expression he intended to put them to the blush. It is highly disgraceful and base that the testimony of God should have less weight with us than that of a mortal man.
Abraham was justified by faith, and so are all believers. Scripture foresaw that God would justify the heathen through faith in Christ; therefore believers of any nation, blessed as Abraham was, are justified in the same way he was.
AI summary
Commenting on Galatians 3:6-18
Brethren,.... Whereas in Gal 3:1, he calls them "foolish Galatians", which might seem too harsh and severe, therefore, to mitigate and soften their resentments, he styles them brethren; hoping still well of them, and that they were not so far gone, but that they might be recovered; and imputing the blame and fault rather to their leaders and teachers, than to them: I speak after...