9. So with yourselves, if with your tongue you utter speech that is not intelligible, how will anyone know what is said? For you will be speaking into the air.
10. There are doubtless many different languages in the world, and none is without meaning,
11. but 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.
12. So with yourselves, since you are eager for manifestations of the Spirit, strive to excel in building up the church.
13. Therefore, one who speaks in a tongue should pray that he may 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 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.