νέῳ δὲ σιγᾶν μᾶλλον ἢ λαλεῖν πρέπει → it's fitting for a young man to keep silence rather than to speak (Menander)
κῠβερνητική: ἡ (sc. τέχνη) искусство управления Plat.
(see also: κυβερνητικός) steering, art of steering
