1 Corinthians 14:17

For if I pray in another language, my spirit prays, but my understanding is unfruitful.

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?

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.

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