§43.1Fr. 43
Ὡς ὁ Ἀλέξανδρος ἱστορεῖ ὁ μὲν Θ. οὕτως ἐκτίεθεται Παρμενίδου δόξαν ἐν τῷ πρώτῳ τῆς φυσικῆς ἱστορίας· τὸ παρὰ τὸ ὂν οὐκ ὂν, τὸ οὐκ ὂν οὐδὲν, ἓν ἄρα τὸ ὄν.
Fr. 43 As Alexander relates, Theophrastus sets out the doctrine of Parmenides in the first book of his Inquiry into Nature as follows: "What is besides that which is, is not; what is not is nothing; therefore, what is is one."