He calls them brethren, though some of them were revolted, because they owned Christ, and makes known or declares to them, (so the word is translated, Luke 2:15 1 Thessalonians 15:15 1 Thessalonians 17:26), that the doctrine of the gospel, which he had preached unto them, was no human invention or fiction, nor rested upon human authority, but was from God, immediately revealed to him: and herein he reflecteth upon the false teachers that had seduced them, and, in order to that, vilifled him, as being but a disciple to some other of the apostles, yet teaching otherwise than they taught. I would have you know (saith he) that it is otherwise; the gospel which I preached is not after man. He fully openeth his own meaning in this phrase, in the next words.
Related Commentaries of Galatians 1:11
Galatians 1:11
11 But I certify you, brethren, that the gospel which was preached of me is not after man.