4:12-18 The apostle desires that they would be of one mind with him respecting the law of Moses, as well as united with him in love. In reproving others, we should take care to convince them that our reproofs are from sincere regard to the honour of God and religion and their welfare. The apostle reminds the Galatians of the difficulty under which he laboured when he first came among them. But he notices, that he was a welcome messenger to them. Yet how very uncertain are the favour and respect of men! Let us labour to be accepted of God. You once thought yourselves happy in receiving the gospel; have you now reason to think otherwise? Christians must not forbear speaking the truth, for fear of offending others. The false teachers who drew the Galatians from the truth of the gospel were designing men. They pretended affection, but they were not sincere and upright. An excellent rule is given. It is good to be zealous always in a good thing; not for a time only, or now and then, but always. Happy would it be for the church of Christ, if this zeal was better maintained.

12. be as I am—"As I have in my life among you cast off Jewish habits, so do ye; for I am become as ye are," namely, in the non-observance of legal ordinances. "The fact of my laying them aside among Gentiles, shows that I regard them as not at all contributing to justification or sanctification. Do you regard them in the same light, and act accordingly." His observing the law among the Jews was not inconsistent with this, for he did so only in order to win them, without compromising principle. On the other hand, the Galatian Gentiles, by adopting legal ordinances, showed that they regarded them as needful for salvation. This Paul combats.

ye have not injured me at all—namely, at the period when I first preached the Gospel among you, and when I made myself as you are, namely, living as a Gentile, not as a Jew. You at that time did me no wrong; "ye did not despise my temptation in the flesh" (Ga 4:14): nay, you "received me as an angel of God." Then in Ga 4:16, he asks, "Have I then, since that time, become your enemy by telling you the truth?"