1 Corinthians 14:9-11 J.B. Phillips New Testament (PHILLIPS)
7-9 Even in the case of inanimate objects which are capable of making sound, such as a flute or harp, if their notes all sound alike, who can tell what tune is being played? Unless the bugle-note is clear who will be called to arms? So, in your case, unless you make intelligible sounds with your “tongue” how can anyone know what you are talking about? You might just as well be addressing an empty room!
10-11 There are in the world a great variety of spoken sounds and each has a distinct meaning. But if the sounds of the speaker’s voice mean nothing to me I am a foreigner to him, and he is a foreigner to me.