1 Corinthians 14:9-11 Living Bible (TLB)
9 In the same way, if you talk to a person in some language he doesn’t understand, how will he know what you mean? You might as well be talking to an empty room.
10 I suppose that there are hundreds of different languages in the world, and all are excellent for those who understand them, 11 but to me they mean nothing. A person talking to me in one of these languages will be a stranger to me and I will be a stranger to him.