21. 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].