Plato, Laws 782b

παμπληθεῖς μεταβολὰς εἰκός; πῶς γὰρ οὔ; τί οὖν; πιστεύομεν ἀμπέλους τε φανῆναί πού ποτε πρότερον οὐκ οὔσας; ὡσαύτως δὲ καὶ ἐλάας καὶ τὰ Δήμητρός τε καὶ Κόρης δῶρα; Τριπτόλεμόν τέ τινα τῶν τοιούτων γενέσθαι διάκονον; ἐν ᾧ δὲ μὴ ταῦτα ἦν τῷ χρόνῳ, μῶν οὐκ οἰόμεθα τὰ ζῷα, καθάπερ νῦν, ἐπὶ τὴν ἀλλήλων ἐδωδὴν τρέπεσθαι; τί μήν;

innumerable changes? Certainly. Are we to believe, then, that vines, not previously existing, appeared at a certain stage; and olives, likewise, and the gifts of Demeter and Kore? And that some Triptolemus was the minister of such fruits? And during the period that these fruits were as yet non-existent, must we not suppose that the animals turned, as they do now, to feeding on one another. Of course.