I had once to defend the truth of the gospel even against a church leader

^11-14 Later, however, when Peter came to Antioch I had to oppose him publicly, for he was then plainly in the wrong. It happened like this. Until the arrival of some of James’ companions, he, Peter, was in the habit of eating his meals with the Gentiles. After they came, he withdrew and ate separately from the Gentiles—out of sheer fear of what the Jews might think. The other Jewish Christians carried out a similar piece of deception, and the force of their bad example was so great that even Barnabas was affected by it. But when I saw that this behaviour was a contradiction of the truth of the Gospel, I said to Peter so that everyone could hear, “If you, who are a Jew, do not live like a Jew but like a Gentile, why on earth do you try to make Gentiles live like Jews?”