1 Corinthians 14:21-23

Goodspeed(i) 21 In the Law it says, "By men of strange languages and by the lips of foreigners I will speak to this nation, and not even then will they listen to me, says the Lord." 22 So this ecstatic speaking is meant as a sign not to those who believe but to unbelievers, but inspired preaching is a sign not to unbelievers but to those who believe. 23 Hence, if the whole church assembles and they all speak ecstatically, and ordinary people or unbelievers come in, will they not say that you are crazy?