Plato, Laws 928a

διὸ δὴ περὶ τοῦτο αὐτὸ τὴν ὀρφανῶν πέρι νομοθεσίαν παραμυθούμενός τε καὶ ἀπειλῶν ὁ νόμος ἐσπούδακεν. ἔτι δʼ ἀπειλή τις ἂν τοιάδε εἴη μάλα ἔγκαιρος· ὃς ἂν θῆλυν εἴτε ἄρρενα ἐπιτροπεύῃ, καὶ ὃς ἂν ἐπιτρόπου φύλαξ τῶν νομοφυλάκων καταστὰς ἐπιμελῆται, μὴ χεῖρον ἀγαπάτω τῶν αὑτοῦ τέκνων τὸν τῆς ὀρφανικῆς μετειληφότα τύχης, μηδὲ τῶν οἰκείων τῶν τοῦ τρεφομένου χεῖρον χρημάτων ἐπιμελείσθω,

Consequently, in its regulations concerning orphans the law has emphasized this very point both by admonition and by threat. A threat, moreover, of the following kind will be extremely opportune:—Whosoever is guardian of a male or female child, and whosoever of the Law-wardens is appointed supervisor of a guardian, shall show as much affection for the child whom Fate has made an orphan as for his own children, and he shall zealously care for the goods of his nursling as much as for his own goods—or rather, more.