14:6. But now, brethren, if I come to you speaking with tongues, what shall I profit you, unless I speak to you either in revelation or in knowledge or in prophecy or in doctrine?
14:7. Even things without life that give sound, whether pipe or harp, except they give a distinction of sounds, how shall it be known what is piped or harped?
14:8. For if the trumpet give an uncertain sound, who shall prepare himself to the battle?
14:9. 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.
14:10. There are, for example, so many kinds of tongues in this world: and none is without voice.
14:11. 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.
14:12. So you also, forasmuch as you are zealous of spirits, seek to abound unto the edifying of the church.
Of spirits... Of spiritual gifts.
14:13. And therefore he that speaketh by a tongue, let him pray that he may interpret.
14:14. For if I pray in a tongue, my spirit prayeth: but my understanding is without fruit.