Bible Study: Romans 10:14-17. "How will they...?"

How then will they call on him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without someone preaching? 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!" But they have not all obeyed the gospel. For Isaiah says, "Lord, who has believed what he has heard from us?" So faith comes from hearing, and hearing through the word of Christ.

"They cannot preach except they be sent, except they be both commissioned and in some measure qualified for their preaching work. How shall a man act as an ambassador, unless he have both his credentials and his instructions from the prince that sends him? This proves that to the regular ministry there must be a regular mission and ordination. It is God’s prerogative to send ministers; he is the Lord of the harvest, and therefore to him we must pray that he would send forth labourers, Mt. 9:38. He only can qualify men for, and incline them to, the work of the ministry." -Matthew Henry