Romans 15:20

"Yea, so have I strived to preach the Gospel, not where Christ was named." See here another preeminence; that he had not only preached the Gospel to so many, and persuaded them, but he did not even go to those who had become disciples. So far was he from thrusting himself upon other men's disciples, and from doing this for glory's sake, that he even made it a point to teach those who had not heard. For neither does he say where they were not persuaded, but "where Christ was not even named," which is more. And what was the reason why he had this ambition? "Lest I should build," he says, "upon another man's foundation." This he says to show himself a stranger to vanity, and to instruct them that it was not from any love of glory, or of honor from them, that he came to write, but as fulfilling his ministry, as perfecting his priestly duty, as loving their salvation. But he calls the foundation of the Apostles "another man's," not in regard to the quality of the person, or the nature of preaching, but in regard to the question of reward. For it was not that the preaching was that of another man, but so far as it went to another man's reward. For the reward of the labors of others was, to this man, another man's.