Paul used a term to reverse what he had formerly believed when he was a Pharisee of the Pharisees, and above his peers in the learning of that Judaism. He was not above his peers in the learning and practice of the Law of Moses.
What he did know of it would have condemned him but it seems he knew nothing but the Oral Law and Traditions of the Fathers that was strongly condemned by Jesus on more than one occasion – if we read the Gospels. They speak the truth about Jesus and that Oral Tradition which is being followed today. We must follow the gospel of our Lord and Savior, Jesus Christ, that was first spoken by Him and then announced by the twelve Apostles and the 72 as well as all of His true disciples. This was done everywhere after the persecution in Jerusalem and Judea, when ‘they were scattered abroad and went everywhere preaching the gospel’. Then Saul was approached by the Savior, on the road to persecuting and imprisoning more :Christians. His glorious conversion, because he had been chosen in his other’s womb, is a mammoth example of the election purposes and marvelous grace of God. He had thought the Gentiles were the dogs. Afterwards, he was shown by the Holy Spirit that those who believed in Christ were the true circumcision of the Spirit, in Christ. The positions were reversed. Those who had called the Gentiles ‘dogs’, were now the dogs. We think of the Canaanitish woman who came to Jesus for healing for her daughter. He restrained her by saying healing was for those of the lost sheep of the house of Israel. He said it was not meet to take the children’s bread and cast it to the dogs – that being the case then but not now. Her reply was: ‘But the dogs eat the crumbs of the children’s breada from the table’. Jesus responded to the faith of this Gentile dog! Her daughter was healed from that hour. Glory to God. Story in Matt.15:22 on.