John Chrysostom
"And so I was eager to preach the Gospel ... where Christ had not been named." Here is yet another distinction of the Apostle. He not only preached the Gospel to many nations and converted them, but also did not come preaching to those who had already been taught. He was so far from drawing another's disciples to himself and doing this for his own glory that he taught only those who had not heard the preaching. Therefore he did not say, "where they had not believed in Christ," but, more significantly, "where Christ had not been named." Why did he take such care over this? "Lest I should build on another man's foundation," he says. By these words he proves that he is free from vainglory.
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At the same time, he suggests to the Romans that he writes to them not from love of glory, nor from a desire to receive honor from them. Rather, he writes because he is fulfilling his ministry, performing sacred service, and caring for their salvation. He calls the "foundation" laid by the Apostles "another man's," not because of the character of the persons, nor because of the nature of the preaching, but with respect to each man's reward. Their preaching in itself was not foreign to him. It was foreign only with respect to the reward, since the reward for labors borne by others was foreign to him.