For it is evident from the Epistles to the Galatians, and the Corinthians, that the Jewish Christians represented Paul to them as not "sound in the Faith," but as teaching a different doctrine from that of the Twelve, and so influential were these representations, that Paul had the greatest difficulty in keeping them to his System.
That there were two Parties, or Schools in the first Christian church, viz.

the adherents of the Apostles, and the Disciples of Paul, is evident from the New Testament, and has been fully, and unanswerably proved by the learned Semler, the greatest scholar certainly in Christian Antiquities, that ever lived.

The knowledge of this secret, accounts for the different conduct of Paul when among his Gentile converts, from that which he pursued when with the apostles at Jerusalem.

He had a difficult part to act, and he managed admirably.

He was indeed, as he says, himself, "all things to all men," a Jew with the Jews, and as one uncircumcised among the uncircumcised.