9So it is with you. Unless you speak intelligible words with your tongue, how will anyone know what you are saying? You will just be speaking into the air.
10Assuredly, there are many different languages in the world, yet none of them is without meaning.
11If, then, I do not know the meaning of someone’s language, I am a foreigner to the speaker, and he is a foreigner to me.
— 1 Corinthians 14:9-11