Ancient Greek text
Ὅτι μὲν οὐχ οἷόν τε συνεῖναι τῶν μαθηματικῶς λεγομένων παρὰ Πλάτωνι μὴ …
Theonis Smyrnaei philosophi platonici Expositio rerum mathematicarum ad legendum Platonem utilium, Teubner, Leipzig, 1878
Theon Smyrnaeus, De utilitate mathematicae, ed. Eduardus Hiller. 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.
Texts from The Greek Library and the Perseus Digital Library, under CC BY-SA 4.0 and CC BY 4.0. Divided into reading sections by Interlinea.