The false apostles were dissatisfied with the verdict of the conference. They did not want to rest circumcision and the practice of the Law in Christian liberty. They insisted that circumcision was obligatory unto salvation.
As the opponents of Paul, so our own adversaries [Luther's, the enemies of the Reformation] contend that the traditions of the Fathers dare not be neglected without loss of salvation. Our opponents will not agree with us on anything. They defend their blasphemies. They go as far to enforce them with the sword.
Paul's victory was complete. Titus, who was with Paul, was not compelled to be circumcised, although he stood in the midst of the apostles when this question of circumcision was debated. This was a blow to the false apostles. With the living fact that Titus was not compelled to be circumcised Paul was able to squelch his adversaries.
VERSES 4,5. And that because of false brethren unawares brought in, who came in privily to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage: To whom we gave place by subjection, no, not for an hour; that the truth of the gospel might continue with you.
Paul here explains his motive for going up to Jerusalem. He did not go to Jerusalem to be instructed or confirmed in his Gospel by the other apostles. He went to Jerusalem in order to preserve the true Gospel for the Galatian churches and for all the churches of the Gentiles.
When Paul speaks of the truth of the Gospel he implies by contrast a false gospel. The false apostles also had a gospel, but it was an untrue gospel. "In holding out against them," says Paul, "I conserved the truth of the pure Gospel."
Now the true Gospel has it that we are justified by faith alone, without the deeds of the Law. The false gospel has it that we are justified by faith, but not without the deeds of the Law. The false apostles preached a conditional gospel.
So do the papists. They admit that faith is the foundation of salvation. But they add the conditional clause that faith can save only when it is furnished with good works. This is wrong. The true Gospel declares that good works are the embellishment of faith, but that faith itself is the gift and work of God in our hearts. Faith is able to justify, because it apprehends Christ, the Redeemer.
Human reason can think only in terms of the Law. It mumbles: "This I have done, this I have not done." But faith looks to Jesus Christ, the Son of God, given into death for the sins of the whole world. To turn one's eyes away from Jesus means to turn them to the Law.
True faith lays hold of Christ and leans on Him alone. Our opponents cannot understand this. In their blindness they cast away the precious pearl, Christ, and hang onto their stubborn works. They have no idea what faith is. How can they teach faith to others?