I do not nullify the grace of God: for if righteousness comes by the law, then Christ is dead in vain.
All Commentaries on Galatians 2:21 Go To Galatians 2
Ambrosiaster
AD 400
The law could not give remission of sins, nor triumph over the second death nor free from captivity those who were bound because of sin. The reason for Christ’s death was to provide those things that the law could not. He did not die in vain, for his death is the justification of sinners.