Book 6, Chapter 6

ἡ δ᾽ οὖν φύσις ἔοικεν ὥσπερ ἐκ μεμιγμένων τινῶν χυμῶν ἐκκρίνειν τῇ πέψει τὸν ἁπλοῦν ᾗ καὶ δόξειεν ἂν ἐναντίως ἢ ἐπὶ τῶν ἄλλων. ἐν μὲν γὰρ τοῖς ἄλλοις ἐκ μίξεως ἡ γένεσις ἐνταῦθα δ᾽ ὥσπερ ἐξ ἀφαιρέσεως καὶ χωρισμοῦ, καὶ ἔνθα μὲν ἐκ τῶν ἀρχῶν ἔνθα δ᾽ αὐτῆς τῆς ἀρχῆς· ἀρχὴ γὰρ τὸ γλυκὺ, τούτου δ᾽ ἡ πέψις ὡς ἁπλῶς εἰπεῖν.