Plutarch, Marcus Cato 339
“Some people blame these traits on Marcus Cato’s cheapness; but others believe he is a model for his rectitude and wisdom, since he counterbalanced the excess of everyone else. But I believe that how he used slaves up as if they were pack animals and then driving them away and selling them when they were old is the mark of a deeply cruel character—one that believes that human beings have nothing in common except for need.
But we know that kindness occupies more territory than justice. For we use law and justice only in reference to human beings, but it is kindness and charity that at times pour out from a gentle character even for the unthinking animals just as water from a full spring. Kind people take care of horses even when they are old and dogs too—not just when they are puppies, but when their old age requires care.”
Ταῦτα δ᾿ οἱ μὲν εἰς μικρολογίαν ἐτίθεντο τοῦ ἀνδρός, οἱ δ᾿ ὡς ἐπὶ διορθώσει καὶ σωφρονισμῷ τῶν ἄλλων ἐνδοτέρω συστέλλοντος ἑαυτὸν ἀπεδέχοντο. πλὴν τὸ τοῖς οἰκέταις ὡς ὑποζυγίοις ἀποχρησάμενον ἐπὶ γήρως ἐλαύνειν καὶ πιπράσκειν ἀτενοῦς ἄγαν ἤθους ἔγωγε τίθεμαι, καὶ μηδὲν ἀνθρώπῳ πρὸς ἄνθρωπον οἰομένου κοινώνημα τῆς χρείας πλέον ὑπάρχειν. καίτοι τὴν χρηστότητα τῆς δικαιοσύνης πλατύτερον τόπον ὁρῶμεν ἐπιλαμβάνουσαν· νόμῳ μὲν γὰρ καὶ τῷ δικαίῳ πρὸς ἀνθρώπους μόνον χρῆσθαι πεφύκαμεν, πρὸς εὐεργεσίας δὲ καὶ χάριτας ἔστιν ὅτε καὶ μέχρι τῶν ἀλόγων ζῴων ὥσπερ ἐκ πηγῆς πλουσίας ἀπορρεῖ τῆς ἡμερότητος. καὶ γὰρ ἵππων ἀπειρηκότων ὑπὸ χρόνου τροφαὶ καὶ κυνῶν οὐ σκυλακεῖαι μόνον, ἀλλὰ καὶ γηροκομίαι τῷ χρηστῷ προσήκουσιν.
I originally posted the picture above of Cato the Younger (Thanks to @illalesbia for pointing it out). Here’s Cato the Elder