1 Corinthians 14:8-10

New King James Version

⁸ For if the trumpet makes an uncertain sound, who will prepare for battle? ⁹ So likewise you, unless you utter by the tongue words easy to understand, how will it be known what is spoken? For you will be speaking into the air. ¹⁰ There are, it may be, so many kinds of languages in the world, and none of them is without ^[a]significance.