In a few passages, the Greek verb nepho and its derivative adjective nephalios are used in the same sense. The word originally had a physical meaning, as opposed to drunkenness, and is thus used in 1Th 5:6,8, as the foundation of the deeper meaning. Used metaphorically also in the Pastoral Epistles and 1 Peter, as sometimes in the classics, for "cool," "unimpassioned." Ellicott, on 1Ti 3:2,11, distinguishes between the two words by regarding sophron "as pointing to the outward exhibition of the inward virtue" implied in nephalios.
H. E. Jacobs