1 Corinthians 14:20-25

YLT(i) 20 Brethren, become not children in the understanding, but in the evil be ye babes, and in the understanding become ye perfect;
21 in the law it hath been written, that, `With other tongues and with other lips I will speak to this people, and not even so will they hear Me, saith the Lord;' 22 so that the tongues are for a sign, not to the believing, but to the unbelieving; and the prophesy is not for the unbelieving, but for the believing, 23 If, therefore, the whole assembly may come together, to the same place, and all may speak with tongues, and there may come in unlearned or unbelievers, will they not say that ye are mad? 24 and if all may prophecy, and any one may come in, an unbeliever or unlearned, he is convicted by all, he is discerned by all, 25 and so the secrets of his heart become manifest, and so having fallen upon his face, he will bow before God, declaring that God really is among you.