Commentaries:
Robertson's Word Pictures (NT)
Unless ye utter speech easy to be understood (ean mh eushmon logon dwte). Condition of third class again (ean and aorist subjunctive). Eushmon (eu, well, shma, sign) is old word, here only in N.T., well-marked, distinct, clear. Good enunciation, a hint for speakers.
Ye will be speaking into the air (esesqe eiv aera lalountev). Periphrastic future indicative (linear action). Cf. aera derwn (beating the air) in I Corinthians 9:26. Cf. our talking to the wind. This was before the days of radio.
Other Robertson's Word Pictures (NT) entries containing 1 Corinthians 14:9:
Luke 1:4
Acts 2:4
Acts 10:46
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