The issue of Titus being circumcised would never have arisen except for the presence of certain false brethren. Paul is anxious to vindicate the apostles from any charges and to show that quite independently from him they had been taught the same things by God, for the Galatians needed to be sure that Christ had revealed a consistent message to all his apostles.
Do we think enough of our liberty? Do we value it sufficiently? It is hard for us to understand perfectly what God has done for us, but do we reflect upon it at all? Whereas people in the world can only sin, can only increase the wrath against them, we can truly advance. Unless we had been justified from the beginning of our Christian lives, we would have no adequate motivation and incentive for holiness, for any obedience to God could only spring from fear, and fear is not able to produce the whole-hearted devotion to God involved in true obedience. Fear anticipates judgment, but love anticipates favour, and we cannot love God unless we know that he is reconciled to us. Only the believer can truly please God. After we have been pardoned by the Lord, death does not legitimately threaten us at every step, and we have access to God through Christ that the Jews never had. We can come and give thanks to God for salvation clearly revealed through Jesus Christ. We can come to our heavenly Father.
False doctrine from wherever it arises must be opposed, for the defence of the true gospel is of greater importance than any individual or group of individuals.
When Paul calls the Judaizers false brethren, does that mean that he viewed them as unconverted? Certainly, for in spite of their believing in Christ, their doctrines were destructive to the gospel. They held the very doctrine which Paul refutes in this letter, and which he says renders Christ of no effect (Galatians 5:4).