Plutarch, De Iside et Osiride 41

οἱ δὲ τοῖσδε τοῖς φυσικοῖς καὶ τῶν ἀπʼ ἀστρολογίας μαθηματικῶν ἔνια μιγνύντες Τυφῶνα μὲν οἴονται τὸν ἡλιακὸν κόσμον, Ὄσιριν δὲ τὸν σεληνιακὸν λέγεσθαι. τὴν μὲν γὰρ σελήνην γόνιμον τὸ φῶς καὶ ὑγροποιὸν ἔχουσαν εὐμενῆ καὶ γοναῖς ζῴων καὶ φυτῶν εἶναι βλαστήσεσι· τὸν δʼ ἥλιον ἀκράτῳ πυρὶ καὶ σκληρῷ καταθάλπειν τε καὶ καταυαίνειν τὰ φυόμενα καὶ τεθηλότα, καὶ τὸ πολὺ μέρος τῆς γῆς παντάπασιν ὑπὸ φλογμοῦ ποιεῖν ἀοίκητον καὶ κατακρατεῖν πολλαχοῦ καὶ τῆς σελήνης. διὸ τὸν Τυφῶνα Σὴθ ἀεὶ Αἰγύπτιοι καλοῦσιν, ὅπερ ἐστὶ καταδυναστεῦον ἢ καταβιαζόμενον. καὶ τῷ μὲν ἡλίῳ τὸν Ἡρακλέα μυθολογοῦσιν ἐνιδρυμένον συμπεριπολεῖν, τῇ δὲ σελήνῃ τὸν Ἑρμῆν. λόγου γὰρ ἔργοις ἔοικε καὶ περισσῆς σοφίας τὰ τῆς σελήνης, τὰ δʼ ἡλίου πληγαῖς ὑπὸ βίας καὶ ῥώμης περαινομένοις. οἱ δὲ Στωικοὶ τὸν μὲν ἥλιον ἐκ θαλάττης ἀνάπτεσθαι καὶ τρέφεσθαί φασι, τῇ δὲ σελήνῃ τὰ κρηναῖα καὶ λιμναῖα νάματα γλυκεῖαν ἀναπέμπειν καὶ μαλακὴν ἀναθυμίασιν.

But the Egyptians, by combining with these physical explanations some of the scientific results derived from astronomy, think that by Typhon is meant the solar world, and by Osiris the lunar world; they reason that the moon, because it has a light that is generative and productive of moisture, is kindly towards the young of animals and the burgeoning plants, whereas the sun, by its untempered and pitiless heat, makes all growing and flourishing vegetation hot and parched, and, through its blazing light, renders a large part of the earth uninhabitable, and in many a region overpowers the moon. For this reason the Egyptians regularly call Typhon Seth, which, being interpreted, means overmastering and compelling. They have a legend that Heracles, making his dwelling in the sun, is a companion for it in its revolutions, as is the case also with Hermes and the moon. In fact, the actions of the moon are like actions of reason and perfect wisdom, whereas those of the sun are like beatings administered through violence and brute strength. The Stoics assert that the sun is kindled and fed from the sea, but that for the moon the moving waters from the springs and lakes send up a sweet and mild exhalation.