17. In this case, certainly, you give thanks well, but the other person is not edified.
18. I thank my God that I speak in tongues for all of you.
19. But in the Church, I prefer to speak five words from my mind, so that I may instruct others also, rather than ten thousand words in tongues.
20. Brothers, do not choose to have the minds of children. Instead, be free of malice like infants, but be mature in your minds.
21. It is written in the law: "I will speak to this people with other tongues and other lips, and even so, they will not heed me, says the Lord."
22. And so, tongues are a sign, not for believers, but for unbelievers; and prophecies are not for unbelievers, but for believers.
23. If then, the entire Church were to gather together as one, and if all were to speak in tongues, and then ignorant or unbelieving persons were to enter, would they not say that you were insane?
24. But if everyone prophesies, and one who is ignorant or unbelieving enters, he may be convinced by it all, because he understands it all.