1. So the truth of the gospel might remain with you (1-5)
Paul's next trip to Jerusalem, many years later, was made as a result of a revelation from God. He went with Barnabas and Titus, a Gentile believer who would become useful to Paul. There he met James, Peter and John and set out before them the gospel he was preaching. The leaders accepted Paul's ministry and did not even compel Titus to be circumcised. The gospel Paul preached everywhere, from beginning to end, was the gospel of salvation by faith in Jesus Christ.
2. Same gospel; different mission fields (6-10)
Although Paul respected the Jerusalem leaders, what was more important to him was that they respected the gospel. These men saw God's work in Paul's ministry and accepted him with the right hand of fellowship. The gospel Paul preached to the Gentiles was the same gospel preached to the Jews-same gospel, but taught in a different mission field. Paul would go to the Gentiles. Peter and the others would preach to the Jews.
Application: Lord, it matters not who preaches the gospel; just let it be preached everywhere.
One Word: Preach the gospel everywhere