1 Corinthians 14:7-9

International Standard Version

⁷ In the same way, lifeless instruments like the flute or harp produce sounds. But if there’s no difference in the notes, how can a person tell what tune is being played? ⁸ For example, if a bugle doesn’t sound a clear call, who will get ready for battle? ⁹ In the same way, unless you speak an intelligible message with your language, how will anyone know what is being said? You’ll be talking into the air!