1 Corinthians 14:12-16

So you too, since you are eager to possess spiritual gifts, strive to excel for the edification of the church.

Therefore, one who speaks in a tongue is to pray that he may interpret.

For if I pray in a tongue, my spirit prays, but my mind is unproductive.

What is the outcome then? I will pray with the spirit, but I will pray with the mind also; I will sing with the spirit, but I will sing with the mind also.

For otherwise, if you bless God in the spirit only, how will the one who occupies the place of the outsider know to say the “Amen” at your giving of thanks, since he does not understand what you are saying?