The anecdote appears in Plutarch’s life of Alcibiades:
> After he [Alcibiades] had finished his education, he went into a school, and asked the master for a volume of Homer. When the master said that he possessed none of Homer’s writings, he struck him with his fist, and left him. Another schoolmaster told him that he had a copy of Homer corrected by himself. “Do you,” asked he, “you who are able to correct Homer, teach boys to read! One would think that you could instruct men.”
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> Plutarch (2nd century). _Life of Alcibiades_ , VII. Translated by Aubrey Stewart & George Long (1894). London: George Bell.