Romans 15:20

“Yea, so have I strived to preach the Gospel, etc..] The sense is, not barely that he strove to preach the Gospel and not the law, the pure Gospel, and, not a mixed one; nor only that he endeavoured to preach it fully, and leave out nothing; but that he had an holy ambition to preach it, not where Christ was named; as in Judea, where he had been for many ages spoken of and expected, and where he had lately appeared, lived, suffered, and died, and where his Gospel had been preached by all the apostles; as also in such parts of the Gentile world, where others of the apostles had been, and had made mention of his name, and published the glad tidings of salvation by him; but he chose rather to go…”

“Yea, &c.--rather, "Yet making it my study (compare Co2 5:9; Th1 4:11, Greek) so to preach the Gospel, not where Christ was [already] named, that I might not build upon another man's foundation: but (might act) as it is written, To whom no tidings of Him came, they shall see," &c.”

“Yea, so have I strived - The word used here φιλοτιμούμενον philotimoumenon means properly “to be ambitious, to be studious of honor;” and then to “desire” earnestly. In that sense it is used here. He earnestly desired; he made it a point for which he struggled, to penetrate into regions which had not heard the gospel. Not where Christ was named - Where the gospel had not been before preached. Lest I should build ... - That is, he desired to found churches himself; he regarded himself as particularly called to this. Others might be called to edify the church, but he regarded it as his function to make known the name of the Saviour where it was not before known. This work was particularly…”

“Not where Christ had been named - These places he generally declined, though not altogether, having an holy ambition (so the Greek word means) to make the first proclamation of the gospel in places where it was quite unheard of, in spite of all the difficulty and dangers that attended it. Lest I should only build upon another man's foundation - The providence of God seemed in a special manner, generally, to prevent this, though not entirely, lest the enemies of the apostle, who sought every occasion to set light by him, should have had room to say that he was behind other apostles, not being sufficient for planting of churches himself, but only for preaching where others had been already; or…”

“so: Co2 10:14-16 build: Co1 3:9-15; Co2 10:13-16; Eph 2:20-22 Romans 15:21”