Thus striving to preach the gospel, etc. As it was necessary for Paul not only to prove himself to be the servant of Christ and a pastor of the Christian Church, but also to show his title to the character and office of an Apostle, that he might gain the attention of the Romans, he mentions here the proper and peculiar distinction of the apostleship; for the work of an Apostle is to propagate the gospel where it had not been preached, according to that command, "Go ye, preach the gospel to every creature." (Mark 16:15.) And this is what we ought carefully to notice, lest we make a general rule of what specially belongs to the Apostolic order: nor ought we to consider it a fault, that a successor was substituted who built up the Church. The Apostles then were the founders as it were of the Church; the pastors who succeeded them, had to strengthen and amplify the building raised up by them. [1] He calls that another's foundation, which had been laid by the hand of another: otherwise Christ is the only stone on which the Church is founded. See 1-Corinthians 3:11; and Ephesians 2:20

Footnotes

1 - The participle, "striving," rendered annitens by Calvin and by Erasmus, is philotimoumenos, which means to strive honorably: it is to seek a thing as an object of honor or ambition. It may be rendered here, "honorably striving;" Doddridge has, "It hath been the object of my ambition;" Stuart, "I was strongly desirous;" and Wolfius, "honori mihi ducentem -- esteeming it an honor to me." It is used to express both an honorable and an earnest or diligent pursuit. It is found in two other places, teeming it an honor," or, "Being ambitious." -- Ed.

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 adapted to the ardor, zeal, energy, and bravery of such a man as Paul. Every man has his proper gift; and there are some particularly suited to "found" and establish churches; others to edify and comfort them; compare 2-Corinthians 10:13-16. The apostle chose the higher honor, involving most danger and responsibility; but still any office in building up the church is honorable.

So have I strived to preach the Gospel - Οὑτω δε φιλοτιμουμενον· For I have considered it my honor to preach the Gospel where that Gospel was before unknown. This is the proper import of the word φιλοτιμεισθαι; from φιλος, a friend, and τιμη, honor. As I am not ashamed of the Gospel of Christ, so I esteem it an honor to preach it, and especially to proclaim it among the heathen; not building on another man's foundation - not watering what another apostle had planted; but cheerfully exposing myself to all kinds of dangers and hardships, in order to found new Churches.

Yea, so have I strived to preach the Gospel,.... 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 to such Heathen nations, as were wholly without any knowledge of him; who had only the dim light of nature to guide them; had had no promises nor prophecies of the Messiah, nor so much as any hints, at least very distant ones, concerning him; and where as yet the sound of the Gospel bad not reached:
lest I should build on another man's foundation; meaning not the law of Moses, nor the doctrines of the false teachers, but the foundation of the true apostles, and which was no other than the foundation Christ, he himself laid; but he chose not to go where they had laid the foundation by preaching Christ and his Gospel, that he might not take another man's crown, or boast in another man's line, or of other men's labours; but rather to go where others had never been, that he might first lay the foundation himself, by preaching Christ, and him crucified, and so the more act up to his character as an apostle, and as the apostle to the Gentiles.

Yea, &c.--rather, "Yet making it my study (compare 2-Corinthians 5:9; 1-Thessalonians 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.

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 that he declined the more difficult part of the ministry