# Adversus mathematicos 21-4

Sextus Empiricus, Adversus mathematicos, <ΠΡΟΣ ΛΟΓΙΚΟΥΣ Β΄.>. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/sextus-empiricus/adversus-mathematicos/21-4

εἰ δέ ἐστί τι ἄδηλον ἀληθές, οὐ μόνον τὸ φαινόμενόν ἐστιν ἀληθές, ὧς ἀρχῆθεν ὑπέκειτο. εἶτα πόθεν ὅτι καὶ τὸ ἄδηλον τοῦτο ἀληθές ἐστιν; εἰ μὲν γὰρ αὐτόθεν, ἔσται καὶ πάντα τὰ ἄδηλα τῶν πραγμάτων αὐτόθεν ἀληθῆ. εἰ δ’ ὡς ἀποδειχθέν, πάντως ἢ ἐξ ἀδήλου ἢ ἐκ φαινομένου ἀποδειχθὲν ἔσται ἀληθές. καὶ εἰ μὲν ἐξ ἀδήλου, ἐκεῖνο πάλιν ἐξ ἄλλου τινὸς δεήσει κεκρίσθαι, καὶ τὸ τρίτον ἐκ τετάρτου, καὶ οὕτως εἰς ἄπειρον·

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Sextus Empiricus, Adversus mathematicos, ed. Hermann Mutschmann, Jürgen Mau. Text: The Greek Library, from the Perseus Digital Library and other open sources, CC BY-SA 4.0. Changes: apostrophes normalised and the text divided into reading sections by Interlinea.
License: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/). Source: https://thegreeklibrary.pages.lisn.upsaclay.fr/works/tlg0544.tlg002.local001/.