Ro 10:13-15 "For whosoever shall call upon the name of the Lord shall be saved. 14 How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher? 15 And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things!"
"Zeal without knowledge is like a mettled horse without eyes, or like a sword in a madman's hand; and there is no knowledge where there is not the word: for if they reject the word of the Lord, and act not by that, 'What wisdom is in them?' saith the prophet (Jer 8:9; Isa 8:20). "