1 Corinthians 14:21-23

Mace(i) 21 in the law it is written, " with men of other tongues and other lips, will I speak unto this people: and yet for all that will they not hear me, saith the Lord." 22 wherefore tongues are for a sign, not to believers, but to unbelievers: but expounding the prophets, not for unbelievers so much as for those who believe. 23 when therefore the whole church is assembled, and all speak different languages, if such as are either unlearned, or are unbelievers should come in, will they not say you are all mad?