Enchiridion · §26

ἔστι δ᾽ ἐκ τοῦ κοινοῦ βίου μαθεῖν τὸ θέλημα τῆς φύσεως. ὅτε γὰρ ὁ παῖς τοῦ γείτονος κατέαξε τὸ ποτήριον, ἕτοιμοί ἐσμεν λέγειν "τοιαῦτα γίνεται". ἴσθι τοίνυν ὅτι ὅταν καὶ τὸ σόν σοι κατεαγῇ, τοιοῦτον εἶναι δεῖ οἷον ἦσθα ὅτε τὸ ἐκείνου κατεάγη. μετάφερε τοῦτο καὶ ἐπὶ τὰ μείζω. τοῦ ἄλλου παιδίον ἀπέθανεν ἢ γυνή· οὐδείς ἐστιν ὃς οὐκ ἂν εἴποι ὅτι "ἀνθρώπινον". ἀλλ᾽ ὅταν τὸ ἴδιον ἀποθνήσκῃ, εὐθύς "οἴμοι, τάλας ἐγώ".

esti d' ek tou koinou biou mathein to thelēma tēs phuseōs. hote gar ho pais tou geitonos kateaxe to potērion, hetoimoi esmen legein 'toiauta ginetai'. isthi toinun hoti hotan kai to son soi kateagē, toiouton einai dei hoion ēstha hote to ekeinou kateagē.

The will of nature may be learned from those things on which we all agree. When a neighbor's child breaks a cup, we are ready to say: 'These things happen.' Know, then, that when your own cup is broken, you ought to respond as you did when your neighbor's was broken. Apply the same principle to greater things. Another man's child or wife has died: there is no one who would not say, 'Such is the lot of mortals.' But when your own dies, immediately it is 'Woe is me, how wretched I am!'

— Enchiridion 26

Source: Greek (Schenkl/Oldfather critical edition tradition) + Long 1877 English translation