Plato, Laws 807d

ὀρθότατα. πάρεργον γὰρ οὐδὲν δεῖ τῶν ἄλλων ἔργων διακώλυμα γίγνεσθαι τῶν τῷ σώματι προσηκόντων εἰς ἀπόδοσιν πόνων καὶ τροφῆς, οὐδʼ αὖ ψυχῇ μαθημάτων τε καὶ ἐθῶν, πᾶσα δὲ νύξ τε καὶ ἡμέρα σχεδὸν οὐκ ἔστιν ἱκανὴ τοῦτʼ αὐτὸ πράττοντι τὸ τέλεόν τε καὶ ἱκανὸν αὐτῶν ἐκλαμβάνειν· οὕτω δὴ τούτων πεφυκότων, τάξιν δεῖ γίγνεσθαι πᾶσιν τοῖς ἐλευθέροις τῆς διατριβῆς περὶ τὸν χρόνον ἅπαντα, σχεδὸν

of bodily and spiritual excellence in general. For there ought to be no other secondary task to hinder the work of supplying the body with its proper exercise and nourishment, or the soul with learning and moral training: nay, every night and day is not sufficient for the man who is occupied therein to win from them their fruit in full and ample measure. So this being nature’s law, a program must be framed for all the freeborn men, prescribing how they shall pass their time continuously,