9. So likewise you, except you utter by the tongue plain speech, how shall it be known what is said? For you shall be speaking into the air.
10. There are, for example, so many kinds of tongues in this world; and none is without voice.
11. If then I know not the power of the voice, I shall be to him to whom I speak a barbarian; and he that speaketh, a barbarian to me.
12. So you also, forasmuch as you are zealous of spirits, seek to abound unto the edifying of the church.
13. And therefore he that speaketh by a tongue, let him pray that he may interpret.
14. For if I pray in a tongue, my spirit prayeth, but my understanding is without fruit.
15. What is it then? I will pray with the spirit, I will pray also with the understanding; I will sing with the spirit, I will sing also with the understanding.