sobriety
From LSJ
ἡ κέρκος τῇ ἀλώπεκι μαρτυρεῖ → you can tell a fox by its tail, small traits give the clue to the character of a person
self-control: P. ἐγκράτεια, ἡ.
discretion: P. and V. τὸ σῶφρον, τὸ σωφρονεῖν, Ar. and P. σωφροσύνη, ἡ.
calmness: Ar. and P. ἡσυχία, ἡ.