From sophron; soundness of mind, i.e. (literally) sanity or (figuratively) self-control -- soberness, sobriety.
see GREEK sophron
a. soundness of mind (opposed to μανία, Xenophon, mem. 1, 1, 16; Plato, Prot., p. 323 b.): ῤήματα σωφροσύνης, words of sanity (A. V. soberness), Acts 26:25.
b. self-control, sobriety (ea virtus, cujus propriam est, motus animi appetentes regere et sedare semperque adversantem libidini moderntam in omni re servare constantiam, Cicero, Tusc. 3, 8, 17; ἡ σωφροσύνη ἐστι καί ἡδονῶν τινων καί ἐπιθυμιῶν ἐγκράτεια, Plato, rep. 4, 430 e.; cf. Phaedo, p. 68 c.; sympos., p. 196c.; (Diogenes Laërtius 3, 91; 4 Macc. 1:31; σωφροσύνη δέ ἀρετή δἰ ἥν πρός τάς ἡδονάς τοῦ σώματος οὕτως ἔχουσιν ὡς ὁ νόμος κελευει, ἀκολασία δέ τοὐναντίον, Aristotle, rhet. 1, 9, 9): 1 Timothy 2:15; joined with αἰδώς (as in Xenophon, Cyril 8, 1, 30f) ibid. 9; (cf. Trench, N. T. Synonyms, § xx., and see αἰδώς).