From the base of sozo and that of phren; safe (sound) in mind, i.e. Self-controlled (moderate as to opinion or passion) -- discreet, sober, temperate.
see GREEK sozo
see GREEK phren
a. of sound mind, sane, in one's senses (see σωφρονέω, a. and σωφροσύνη, a.).
b. curbing one's desires and impulses, self-controlled, temperate (R. V. soberminded) ((ἐπιθυμεῖ ὁ σώφρων ὧν δεῖ καί ὡς δεῖ καί ὅτε, Aristot eth. Nic. 3, 15 at the end), see (σωφροσύνη, b.): 1 Timothy 3:2; Titus 1:8; Titus 2:2, 5. STRONGS NT 4998a: τ [τ ,Tau: on the receding (ττ( in the vocabulary of the N. T. before (σς(, see under Sigma.]