After he finished at Antioch with many disciples, but driven out of town by the unbelieving Jews, Paul continued into the interior of Asia Minor. Preaching along the way, he stopped first at Iconium, then Lystra and Derbe, before returning to port to sail back toward Jerusalem.
The deeper he went into Gentile territory, the less we see him involved with the synagogues. His was a message to Jew first, but also (maybe, mainly) to Gentiles. Paul's meesage received eager acceptance by the Gentiles; so much so that the Jews continued to instigate persecution against him. Once he was even stoned by them and left for dead.
Jesus healed him and he used the intensity of that event to warn and stimulate these new Christians: It takes perseverance to stay with Jesus.