Unless ye utter by the tongue — Which is miraculously given you. Words easy to be understood — By your hearers. Ye will speak to the air — A proverbial expression. Will utterly lose your labour.
Related Commentaries of 1 Corinthians 14:9
1 Corinthians 14:9
9 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.