1 Corinthians 14:12-20 Revised Standard Version (RSV)
12 So with yourselves; since you are eager for manifestations of the Spirit, strive to excel in building up the church.
13 Therefore, he 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 unfruitful. 15 What am I to do? I will pray with the spirit and I will pray with the mind also; I will sing with the spirit and I will sing with the mind also. 16 Otherwise, if you bless[a] with the spirit, how can any one in the position of an outsider[b] say the “Amen” to your thanksgiving when he does not know what you are saying? 17 For you may give thanks well enough, but the other man is not edified. 18 I thank God that I speak in tongues more than you all; 19 nevertheless, in church I would rather speak five words with my mind, in order to instruct others, than ten thousand words in a tongue.
20 Brethren, do not be children in your thinking; be babes in evil, but in thinking be mature.