1 Corinthians 14:20

For you most certainly give thanks well, but the other person is not built up.

I thank my God, I speak with other languages more than you all.

However, in the assembly I would rather speak five words with my understanding, that I might instruct others also, than ten thousand words in another language.

In the law it is written, “By men of strange languages and by the lips of strangers I will speak to this people. They won’t even listen to me that way, says the Lord.”

Therefore other languages are for a sign, not to those who believe, but to the unbelieving; but prophesying is for a sign, not to the unbelieving, but to those who believe.

If therefore the whole assembly is assembled together and all speak with other languages, and unlearned or unbelieving people come in, won’t they say that you are crazy?