Adam Clarke on Galatians 1:10

Do I now persuade men, or God? - The words πειθειν τον Θεον may be rendered to court or solicit the favor of God as the after clause sufficiently proves. This acceptation of πειθειν is very common in Greek authors. While the apostle was a persecutor of the Christians, he was the servant of men, and pleased men. When he embraced the Christian doctrine, he became the servant of God, and pleased Him. He therefore intimates that he was a widely different person now from what he had been while a Jew.