(2-6) There can be no compromise between Christianity and Judaism. If you accept the one you must give up the other. Circumcision is a pledge or engagement to live by the rule of the Law. That rule must be taken as a whole. You are committed to the practice of the whole Law, and in that way alone you must seek for justification. Our position is something quite different. We hope to be admitted into a state of righteousness through the action of the Spirit on God’s side, and through faith on our own. The Christian owes the righteousness attributed to him, not to circumcision, but to a life of which faith is the motive and love the law.
The whole tenor of the Epistle shows that the Apostle viewed the attempts of the Judaising party with indignation; and at this point his language takes a more than usually stern and imperative tone. He speaks with the full weight of his apostolic authority, and warns the Galatians that no half-measures will avail, but that they must decide, once for all, either to give up Judaism or Christ.
This is one of the passages which have been insisted on as proving a direct antagonism between St. Paul and the other Apostles; but any one who enters into the thought of the Apostle, and follows the course of his impassioned reasoning, will see how unnecessary any such assumption is. Nothing is more in accordance with human nature than that the same man should at one time agree to the amicable compromise of Acts 15, and at another, some years later, with the field all to himself, and only his own converts to deal with, should allow freer scope to his own convictions. He is speaking with feelings highly roused, and with less regard to considerations of policy. Besides, the march of events had been rapid, and the principles of policy themselves would naturally change.