John of Damascus — on Gal 2:15

“Having worked out from the case of those around Peter that circumcision should not be applied, he now works this out in a more complete way. For if those who were Jews from childhood, and not prostylites, but having been brought up in the Law, having seen the weakness of the Law in justifying man, transpose themselves to the grace through faith, how much more those who were not from the beginning from the Law, but from the nations, and having later come to believe in Christ, are not obliged to incline themselves to the Law which is impotent in making one upright.”