Saul’s stay in Damascus (after his conversion); Acts 9:20-22

Church History: 20At once he began to preach in the synagogues that Jesus is the Son of God. 21All those who heard him were astonished and asked, "Isn't he the man who raised havoc in Jerusalem among those who call on this name? And hasn't he come here to take them as prisoners to the chief priests?" 22Yet Saul grew more and more powerful and baffled the Jews living in Damascus by proving that Jesus is the Christ.
He began immediately. This was clear evidence of the genuineness of his conversion, that he was willing at once to avow himself to be the friend of the Lord Jesus. He proclaimed and proved that Jesus was the Christ. Paul continued the practice of attending the synagogues; and in the synagogues any one had a right to speak, who was invited by the officiating minister.2
He confused and confounded those that opposed the doctrine of Christ. He identified himself, not only in the pulpit, but in the schools, and showed himself supernaturally enabled, not only to preach the truth, but to maintain and defend it when he had preached it. He increased in strength. He became more intimately acquainted with the gospel of Christ, and his pious affections grew stronger. He grew more bold and daring and resolute in defense of the gospel: He increased more for the reflections that were cast upon him in which his new friends upbraided him as having been a persecutor, and his old friends upbraided him as being now a turncoat; but Saul, instead of being discouraged by the various remarks made upon his conversion, was much more emboldened, finding he had enough at hand wherewith to answer the worst they could say to him. He ran down his antagonists, and confounded the Jews who dwelt in Damascus; he silenced them, and shamed them. He answered their objections to the satisfaction of all indifferent persons, and pressed them with arguments to which they could make no reply. In all his discourses with the Jews he was still proving that this Jesus is Christ. He is the Christ, the anointed of God, the true Messiah promised to the fathers. He was proving it, affirming it and confirming it, teaching with persuasion. And we have reason to think he was instrumental in converting many to the faith of Christ, and building up the church at Damascus, which he went thither to make havoc of. Thus out of the eater came forth meat, and out of the strong sweetness.