1 Corinthians 14:7-11

7Even lifeless instruments that produce sounds — whether flute or harp  — if they don’t make a distinction in the notes, how will what is played on the flute or harp be recognized?

8In fact, if the bugle makes an unclear sound, who will prepare for battle?

9In the same way, unless you use your tongue for intelligible speech, how will what is spoken be known? For you will be speaking into the air.

10There are doubtless many different kinds of languages in the world, none is without meaning.

11Therefore, if I do not know the meaning of the language, I will be a foreigner to the speaker, and the speaker will be a foreigner to me.