1 Corinthians 14:9

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 ei aera lalounte). Periphrastic future indicative (linear action). Cf. aera derwn (beating the air) in Acts 9:26 . Cf. our talking to the wind. This was before the days of radio.