Galatians 2:1 Then fourteen years after I went up again to Jerusalem with Barnabas, and took Titus with me also.
2 And I went up by revelation, and communicated unto them that gospel which I preach among the Gentiles, but privately to them which were of reputation, lest by any means I should run, or had run, in vain.
Now Paul after preaching mostly to the gentiles for the 14 years he returns to Jerusalem with two of his companions. Barnabas was one that helped him to be accepted by the Christians as a preacher of the gospel. Titus was a gentile convert that continued to travel with Paul to gain as much knowledge as he could from him. He went this time because the Holy Spirit sent him to reveal to the leaders of the Jerusalem church the gospel that he preached to the gentiles. Paul new the message he preached was given to him by God and so it was correct but he wanted the approval of the church leaders about preaching this message to the gentiles and bringing them into the church. This helps us to see that when we are out on our own leading people to Christ it does not hurt to have someone we hold to a higher standard to be someone we can bounce our ideas in how we do things off them.