Note 19 — Chapter VI · ANALYTICA PRIORA II.
Reading edition
Ibid. II. xvi. p. 64, b. 30-35: καὶ γὰρ εἰ ὅλως μὴ συλλογίζεται, καὶ εἰ δι’ ἀγνωστοτέρων ἢ ὁμοίως ἀγνώστων, καὶ εἰ διὰ τῶν ὑστέρων τὸ πρότερον· ἡ γὰρ ἀπόδειξις ἐκ πιστοτέρων τε καὶ προτέρων ἐστιν.… τὰ μὲν δι’ αὑτῶν πέφυκε γνωρίζεσθαι, τὰ δὲ δι’ ἄλλων.