Theophylact of Ohrid — on Gal 2:21 (Commentary on Galatians)

“After these reasonings, he finally declares: I do not reject the gift of Christ, by which He deemed me worthy, having justified me without works by His death, and I do not resort to the law. For if, he says, the law is able to save and justify, then Christ died entirely in vain. But He, without a doubt, died in order to save us by His death, which the law is powerless to do. And if the law saves, the death of Christ is superfluous. Do you see where such blasphemy leads?”