John Calvin Commentary Romans 11:13

"But I speak to you that are Gentiles. Inasmuch then as I am an apostle of Gentiles, I glorify my ministry;" — Romans 11:13 (ASV)

For to you Gentiles I speak, etc. He confirms by a strong reason that nothing will be lost by the Gentiles if the Jews were to return again to favor with God. For he shows that the salvation of both is so connected that it can be promoted by the same means.

He addresses the Gentiles in this way: “Though I am uniquely destined to be your Apostle, and therefore ought with special care to seek your salvation (with which I am entrusted), and to omit, so to speak, all other things, and to labor for that alone, I will still be faithfully discharging my office by winning any of my own nation to Christ. And this will be for the glory of my ministry, and thus for your good.”

For whatever served to make Paul’s ministry illustrious was advantageous for the Gentiles, whose salvation was its object.

And here he also uses the verb παραζηλῶσαι, to provoke to emulation, so that the Gentiles might seek the fulfillment of Moses’ prophecy, as he describes it, once they understood that it would be for their benefit.