1 Corinthians 14:18

What should I do? I will pray with the spirit, and I will pray with the understanding also. I will sing with the spirit, and I will sing with the understanding also.

Otherwise, if you bless with the spirit, how will he who fills the place of the unlearned say the “Amen” at your giving of thanks, seeing he doesn’t know what you say?

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

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.

Brothers, don’t be children in thoughts, yet in malice be babies, but in thoughts be mature.

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.”