17 For thou indeed givest thanks well, but the other is not edified.
18 I thank God I speak in a tongue more than all of you:
19 but in the assembly I desire to speak five words with my understanding, that I may instruct others also, rather than ten thousand words in a tongue.
20 Brethren, be not children in your minds, but in malice be babes; but in your minds be grown men.
21 It is written in the law, By people of other tongues, and by strange lips, will I speak to this people; and neither thus will they hear me, saith the Lord.
22 So that tongues are for a sign, not to those who believe, but to unbelievers; but prophecy, not to unbelievers, but to those who believe.
23 If therefore the whole assembly come together in one place, and all speak with tongues, and simple persons enter in, or unbelievers, will not they say ye are mad?