So then, "Whoever calls on the name of the Lord will be saved."
But how can people call on him if they have not believed in him? How can they believe in him if they have not heard his message? How can they hear if no one tells [the Good News]?
How can people tell the Good News if no one sends them? As Scripture says, "How beautiful are the feet of the messengers who announce the Good News."
But not everyone has believed the Good News. Isaiah asks, "Lord, who has believed our message?"
So faith comes from hearing the message, and the message that is heard is what Christ spoke.