1 Corinthians 14
9 Ref So also you, unless you uttered by the tongue words easy to understand, how would it be known what is spoken? For you would be speaking into the air.
10 There are, it may be, so many kinds of sounds in the world, and none of them is without meaning.
11 Ref If then I don't know the meaning of the sound, I would be to him who speaks a foreigner, and he who speaks would be a foreigner to me.