So likewise you, except you utter by the tongue words easy to be understood, how shall it be known what is spoken? for you shall speak into the air.
All Commentaries on 1 Corinthians 14:9 Go To 1 Corinthians 14
John Chrysostom
AD 407
If speaking in tongues is useless, why was it given? It was given for the benefit of the person who has it. But if it is to help others also, then there must be some interpretation.