1 Corinthians 14:7-9

Douay-Rheims 1899 American Edition

⁷ Even things without life that give sound, whether pipe or harp, except they give a distinction of sounds, how shall it be known what is piped or harped?

⁸ For if the trumpet give an uncertain sound, who shall prepare himself to the battle?

⁹ So likewise you, except you utter by the tongue plain speech, how shall it be known what is said? For you shall be speaking into the air.