17.What did the Galatian Christians know of Paul’s history?

Paul previously had been a leader in Judaism. At that time he had vigorously persecuted and laid waste the church of God, attempting to destroy it.

Paul is writing to the Christian people of Galatia who were being persuaded by Jewish Christians that they should be converted to Judaism as part of their Christian experience. Paul was reminding the Galatians that he himself had been active in Judaism. He was as learned in the Law of Moses as were any of the "experts" who were getting them off the straight track of the true Gospel of Christ.