De anima libri mantissa
Alexander of Aphrodisias
Alexander of Aphrodisias. Alexandri Aphrodisiensis Praeter Commentaria Scripta Minora, Pars 1. (Supplementum Aristotelicum, Volume 2. 1). Bruns, Ivo, editor. Berlin: Reimer, 1887.
εἰ μὲν οὖν ἀήρ ἐστι, τί δεῖ αὐτὸν ἐκπεσεῖν, ὄντος γε καὶ ἔξω ἀέρος;
εἰ δὲ φῶς καὶ οἷον ἀὴρ διαυγής (τοιοῦτον γάρ τι τὸ φῶς εἶναι οἰόμεθα), καὶ οὕτως μὲν περίεργος ἡ ἔκπτωσις, ὄντος γε καὶ ἔξω φωτός.
καὶ γὰρ οὐδὲ ἄνευ τοῦ ἔξω δυνατὸν ὁρᾶν ἐστιν.