1 Corinthians 14:9-11

New English Translation

⁹ It is the same for you. If you do not speak clearly with your tongue, how will anyone know what is being said? For you will be speaking into the air. ¹⁰ There are probably many kinds of languages in the world, and none is without meaning. ¹¹ If then I do not know the meaning of a language, I will be a foreigner to the speaker and the speaker a foreigner to me.