1 Corinthians 14:7-9

Contemporary English Version

⁷ If all musical instruments sounded alike, how would you know the difference between a flute and a harp? ⁸ If a bugle call isn't clear, how would you know to get ready for battle?

⁹ This is how it is when you speak unknown languages. If no one can understand what you are talking about, you will only be talking to the wind.