Jamieson, Fausset & Brown

I do not frustrate the grace of God--I do not make it void, as thou, Peter, art doing by Judaizing. for--justifying the strong expression "frustrate," or "make void." is dead in vain--Greek, "Christ died needlessly," or "without just cause." Christ's having died, shows that the law has no power to justify us; for if the law can justify or make us righteous, the death of Christ is superfluous [CHRYSOSTOM]. Next: Galatians Chapter 3