But how are men to call upon 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 a preacher? And how can men preach unless they are sent? As it is written, “How beautiful are the feet of those who preach good news!” 16 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 what is heard, and what is heard comes by the preaching of Christ. But I ask, have they not heard? Indeed they have; for “Their voice has gone out to all the earth, and their words to the ends of the world.” Again I ask, did Israel not understand? First Moses says, “I will make you jealous of those who are not a nation; with a foolish nation I will make you angry.” Then Isaiah is so bold as to say, “I have been found by those who did not seek me; I have shown myself to those who did not ask for me.” But of Israel he says, “All day long I have held out my hands to a disobedient and contrary people.”
–Romans 10:14-21