John Trapp on Galatians 2:21

Verſe 21. I doe not fruſtrate] viz. By ſeeking to be juſtified by the Law. Ambroſe tenders it, Non ſum ingratus gratiae Dei, I am not ungratefull to grace of God: I do not repudiate, caſſate, nullifie it.

Dead in vain] Becauſe he attains not his end in dying, which was not only to leave us a patern of patience, as Anabaptiſts hold; but to merit for us remiſſion of ſins, and imputation of his righteouſnes for our juſtification.