1 Corinthians 14:6-8

New Catholic Bible

⁶ Now suppose, brethren, that I should come to you and speak in tongues. Of what value would I be to you if you were unable to discern from my words any revelation or knowledge or prophecy or instruction? ⁷ Even inanimate things produce sound, such as a flute or a harp. If they do not produce distinct notes, how can anyone tell what tune is being played?

⁸ Or again, if the bugle call is unclear, who will get ready for battle?