So likewise ye, except ye utter by the tongue words easy to be understood, how shall it be known what is spoken? for ye shall speak into the air. (14:9)

There are, it may be, so many kinds of voices in the world, and none of them [is] without signification. (14:10)

Therefore if I know not the meaning of the voice, I shall be unto him that speaketh a barbarian, and he that speaketh [shall be] a barbarian unto me. (14:11)

Even so ye, forasmuch as ye are zealous of spiritual [gifts], seek that ye may excel to the edifying of the church. (14:12)

Wherefore let him that speaketh in an [unknown] tongue pray that he may interpret. (14:13)

For if I pray in an [unknown] tongue, my spirit prayeth, but my understanding is unfruitful. (14:14)

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. (14:15)

Else when thou shalt bless with the spirit, how shall he that occupieth the room of the unlearned say Amen at thy giving of thanks, seeing he understandeth not what thou sayest? (14:16)

For thou verily givest thanks well, but the other is not edified. (14:17)

I thank my God, I speak with tongues more than ye all: (14:18)

Yet in the church I had rather speak five words with my understanding, that [by my voice] I might teach others also, than ten thousand words in an [unknown] tongue. (14:19)