1 Corinthians 14:10-19
English Standard Version
Chapter 14
10There are doubtless many different languages in the world, and none is without meaning, 11but if I do not know the meaning of the language, I will be a foreigner to the speaker and the speaker a foreigner to me. 12So with yourselves, since you are eager for manifestations of the Spirit, strive to excel in building up the church.
13Therefore, one who speaks in a tongue should pray that he may interpret.
14For if I pray in a tongue, my spirit prays but my mind is unfruitful.
15What am I to do? I will pray with my spirit, but I will pray with my mind also; I will sing praise with my spirit, but I will sing with my mind also.
16Otherwise, if you give thanks with your spirit, how can anyone in the position of an outsider say "Amen" to your thanksgiving when he does not know what you are saying?
17For you may be giving thanks well enough, but the other person is not being built up.
18I thank God that I speak in tongues more than all of you.
19Nevertheless, in church I would rather speak five words with my mind in order to instruct others, than ten thousand words in a tongue.