1 Corinthians 14:7-11

7It is similar for lifeless things that make a sound, like a flute or harp. Unless they make a distinction in the notes, how can what is played on the flute or harp be understood?

8If, for example, the trumpet makes an unclear sound, who will get ready for battle?

9It is the same for you. If you do not speak clearly with your tongue, how will anyone know what is being said? For you will be speaking into the air.

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

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