1 Corinthians 14:9-11

It’s the same for you. If you speak to people in words they don’t understand, how will they know what you are saying? You might as well be talking into empty space. There are many different languages in the world, and every language has meaning. But if I don’t understand a language, I will be a foreigner to someone who speaks it, and the one who speaks it will be a foreigner to me.