1 Corinthians 14:8-10

Modern English Version

⁸ If the trumpet makes an uncertain sound, who will prepare himself for the battle? ⁹ So also you, unless with the tongue you speak words easy to understand, how will it be known what is spoken? For you shall speak into the air. ¹⁰ There are, it may be, so many kinds of languages in the world, and none of them is without significance.