So likewise ye, except ye utter by the tongue words easy to be understood, how shall it be known what is spoken? for ye shall speak into the air.
So likewise ye - who have life, as opposed to things without life" (1 Corinthians 14:7).
By the tongue - the language which ye steak in.
Ye shall speak - ye will be speaking into the air - i:e., in vain (1 Corinthians 9:26).