1 Corinthians 14:9-11

Diaglott(i) 9 So also you through the tongue if not a well-marked word you give, how shall be know that having been spoken? you will be for into air speaking. 10 So many, if it may be, kinds of voices is in world, and no one of them unmeaning. 11 If then not I know the power of the voice, I shall be to the one speaking a barbarian; and the one speaking, to me a barbarian.