σιγὴν ἔχειν

From LSJ

Ζήσεις βίον κράτιστον, ἢν θυμοῦ κρατῇς → Vives bene, si sis vacuus iracundia → Am besten lebst du, wenn du deinen Zorn beherrschst

Menander, Monostichoi, 186

Greek > English (Woodhouse)

be hushed, keep silence