And how are they to preach unless they are sent? As it is written, “How beautiful are the feet of those who preach the good news!”
15. How shall they preach except they be sent? etc. He intimates that it is a proof and a pledge of divine love when any nation is favored with the preaching of the gospel; and that no one is a preacher of it, but he whom God has raised up in his special providence, and that hence there is no doubt but that he visits...
The first words express the design of the apostle through these verses, that there is no difference between Jews and Gentiles, but they stand upon the same level in point of acceptance with God. In Jesus Christ there is neither Greek nor Jews, Col 3:11.
Commenting on Romans 10:12-21
And how shall they preach, except they be sent,.... There is no proper, rightful, regular, and lawful preaching of the word without a mission, which is either extraordinary, or ordinary; extraordinary mission was such as the apostles themselves had; who, as they were called to extraordinary service, had extraordinary qualifications, and were sent forth in an extraordinary manner, with a power of doing miracles, and immediately by Christ himself.