Acts 19:21
After these things had happened, Paul purposed in spirit to go to Jerusalem after he had passed through Macedonia and Achaia. "After I have been there," he said, "I must see Rome as well."

Romans 15:20
In this way, I have aspired to preach the gospel where Christ was not known, so that I would not be building on someone else's foundation.

2 Corinthians 11:7
Was it a sin for me to humble myself in order to exalt you, because I preached the gospel of God to you free of charge?