Plato, Laws 636d

κατηγοροῦμεν ὡς λογοποιησάντων τούτων· ἐπειδὴ παρὰ Διὸς αὐτοῖς οἱ νόμοι πεπιστευμένοι ἦσαν γεγονέναι, τοῦτον τὸν μῦθον προστεθηκέναι κατὰ τοῦ Διός, ἵνα ἑπόμενοι δὴ τῷ θεῷ καρπῶνται καὶ ταύτην τὴν ἡδονήν. τὸ μὲν οὖν τοῦ μύθου χαιρέτω, νόμων δὲ πέρι διασκοπουμένων ἀνθρώπων ὀλίγου πᾶσά ἐστιν ἡ σκέψις περί τε τὰς ἡδονὰς καὶ τὰς λύπας ἔν τε πόλεσιν καὶ ἐν ἰδίοις ἤθεσιν· δύο γὰρ αὗται πηγαὶ μεθεῖνται φύσει ῥεῖν, ὧν ὁ μὲν ἀρυτόμενος ὅθεν τε

Because it was the belief that they derived their laws from Zeus, they added on this story about Zeus in order that they might be following his example in enjoying this pleasure as well. Now with the story itself we have no more concern; but when men are investigating the subject of laws their investigation deals almost entirely with pleasures and pains, whether in States or in individuals. These are the two fountains which gush out by nature’s impulse; and whoever draws from them a due supply at the due place and time is blessed—be it a State