Romans 15:18-20

For I will not dare to speak of any of those things which Christ hath not wrought by me, to make the Gentiles obedient, by word and deed, through mighty signs and wonders, by the power of the Spirit of God; so that from Jerusalem, and round about unto Illyricum, I have fully preached the gospel of Christ. Yea, so have I strived to preach the gospel, not where Christ was named, lest I should build upon another man's foundation