(1) Behold, I Paul say unto you, that if ye be (a) circumcised, Christ shall profit you nothing.
(1) Another entreaty in which he plainly witnesses that justification of works, and justification of faith cannot stand together, because no man can be justified by the Law, but he that does fully and perfectly fulfil it. And he takes the example of circumcision, because it was the ground of all the service of the Law, and was chiefly urged by the false apostles.
(a) Circumcision is in other places called the seal of righteousness, but here we must have consideration of the circumstance of the time, for now baptism is a sign of the new covenant, just as circumcision was the sign of the old covenant. And moreover Paul reasons according to the opinion that his enemies had of it, which made circumcision a essential to their salvation.