Book 3, Chapter 16

καὶ περὶ μὲν διαβολῆς εἰρήσθω τοσαῦτα, διήγησις δʼ ἐν μὲν τοῖς ἐπιδεικτικοῖς ἐστιν οὐκ ἐφεξῆς ἀλλὰ κατὰ μέρος· δεῖ μὲν γὰρ τὰς πράξεις διελθεῖν ἐξ ὧν ὁ λόγος· σύγκειται γὰρ ἔχων ὁ λόγος τὸ μὲν ἄτεχνον (οὐθὲν γὰρ αἴτιος ὁ λέγων τῶν πράξεων), τὸ δʼ ἐκ τῆς τέχνης· τοῦτο δʼ ἐστὶν ἢ ὅτι ἔστι δεῖξαι, ἐὰν ᾖ ἄπιστον, ἢ ὅτι ποιόν, ἢ ὅτι ποσόν, ἢ καὶ ἅπαντα.