Plato, Laws 732c

διὸ δὴ γελώτων τε εἴργεσθαι χρὴ τῶν ἐξαισίων καὶ δακρύων, παραγγέλλειν δὲ παντὶ πάντʼ ἄνδρα, καὶ ὅλην περιχάρειαν πᾶσαν ἀποκρυπτόμενον καὶ περιωδυνίαν εὐσχημονεῖν πειρᾶσθαι, κατά τε εὐπραγίας ἱσταμένου τοῦ δαίμονος ἑκάστου, καὶ κατὰ τύχας οἷον πρὸς ὑψηλὰ καὶ ἀνάντη δαιμόνων ἀνθισταμένων τισὶν πράξεσιν, ἐλπίζειν δʼ ἀεὶ τοῖς γε ἀγαθοῖσι τὸν θεὸν ἃ δωρεῖται πόνων μὲν ἐπιπιπτόντων

wherefore men must be restrained from untimely laughter and tears, and every individual, as well as the whole State, must charge every man to try to conceal all show of extreme joy or sorrow, and to behave himself seemly, alike in good fortune and in evil, according as each man’s Genius ranges itself,—hoping always that God will diminish the troubles that fall upon them by the blessings which he bestows, and will change for the better