Plato, Laws 807c

γίγνοιτο ἡμῖν, γίγνοιτο ἂν καὶ μάλα μετρίως. ἔργον δὲ δὴ τοῖς οὕτω ζῶσίν φαμεν οὐ τὸ σμικρότατον οὐδὲ τὸ φαυλότατον λείπεσθαι, μέγιστον δὲ πάντων εἶναι προστεταγμένον ὑπὸ δικαίου νόμου· τοῦ γὰρ πᾶσαν τῶν ἄλλων πάντων ἔργων βίου ἀσχολίαν παρασκευάζοντος, τοῦ Πυθιάδος τε καὶ Ὀλυμπιάδος νίκης ὀρεγομένου, διπλασίας τε καὶ ἔτι πολλῷ πλέονος ἀσχολίας ἐστὶν γέμων ὁ περὶ τὴν τοῦ σώματος πάντως καὶ ψυχῆς εἰς ἀρετῆς ἐπιμέλειαν βίος εἰρημένος

could exist, we might be well content with it. And, we assert, there does remain for men living this life a task that is by no means small or trivial, but rather one that a just law imposes upon them as the weightiest task of all. For as compared with the life that aims at a Pythian or Olympian victory and is wholly lacking in leisure for other tasks, that life we speak of—which most truly deserves the name of life—is doubly (nay, far more than doubly) lacking in leisure, seeing that it is occupied with the care