Treasury of Scripture Knowledge

Summary

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.

Bible References

Easy

1 Corinthians 14:19
Yet in the church I had rather speak five words with my understanding, that by my voice I might teach others also, than ten thousand words in an unknown tongue.

For

1 Corinthians 9:26
I therefore so run, not with uncertainty; so fight I, not as one that beats the air: