Find a map of Paul and Barnabas’s first journey. They started the trip in Antioch and ended their trip in Derbe (14:20), roughly 200 miles by land from where they began. But instead of closing the circle, they retrace the route over 400 miles by land and then back across 400 miles of Mediterranean Sea. Why? Verse 22 says they went back through the cities they had already visited to "strengthen the disciples and encourage them to remain true to the faith." Their goal was never just to preach the gospel and then go elsewhere but to "follow-up" with those who responded and teach them to be multiplying disciples.