"We proclaim [Christ], admonishing and teaching everyone with all wisdom, so that we may present everyone fully mature in Christ." (Colossians 1:28)
"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'!" (Romans 10:14-15)