1 Corinthians 14:20-22

Mace(i) 20 Brethren, be not childish in understanding: be as innocent as babes, but use your understanding like men. 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.