1 Corinthians 14:9-11

Douay-Rheims 1899 American Edition

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.