1 Corinthians 14:12-20 New Revised Standard Version (NRSV)
12 So with yourselves; since you are eager for spiritual gifts, strive to excel in them for building up the church.
13 Therefore, one who speaks in a tongue should pray for the power to interpret. 14 For if I pray in a tongue, my spirit prays but my mind is unproductive. 15 What should I do then? I will pray with the spirit, but I will pray with the mind also; I will sing praise with the spirit, but I will sing praise with the mind also. 16 Otherwise, if you say a blessing with the spirit, how can anyone in the position of an outsider say the “Amen” to your thanksgiving, since the outsider does not know what you are saying? 17 For you may give thanks well enough, but the other person is not built up. 18 I thank God that I speak in tongues more than all of you; 19 nevertheless, in church I would rather speak five words with my mind, in order to instruct others also, than ten thousand words in a tongue.
20 Brothers and sisters,[a] do not be children in your thinking; rather, be infants in evil, but in thinking be adults.