What was part of the revelation of the mystery hidden in God and revealed through Paul?

Les explains that Paul was defending his apostleship and showing his authority as the apostle of the Gentiles. The twelve were now behind him, still beating a dead horse, so to speak, because God had turned from Israel and had now turned to the whole human race. This was all part and parcel of the revelation of the mystery, the secret that had been hid in God but was now revealed through this man. Paul had also suffered inexorably for the sake of the Gospel, and he was up against opposition, as all in Asia were turned against him.