8. For if the trumpet give an uncertain voice, who shall prepare himself for war?
9. So also ye, unless ye utter by the tongue speech easy to be understood, how shall it be known what is spoken? for ye will be speaking into the air.
10. There are, it may be, so many kinds of voices in the world, and no kind is without signification.
11. If then I know not the meaning of the voice, I shall be to him that speaketh a barbarian, and he that speaketh will be a barbarian unto me.
12. So also ye, since ye are zealous of spiritual gifts, seek that ye may abound unto the edifying of the church.
13. Wherefore let him that speaketh in a tongue pray that he may interpret.
14. For if I pray in a tongue, my spirit prayeth, but my understanding is unfruitful.
15. What is it then? I will pray with the spirit, and I will pray with the understanding also: I will sing with the spirit, and I will sing with the understanding also.
16. Else if thou bless with the spirit, how shall he that filleth the place of the unlearned say the Amen at thy giving of thanks, seeing he knoweth not what thou sayest?
17. For thou verily givest thanks well, but the other is not edified.