For it is impossible for any one to begin to learn what he thinks that he already knows.

ἀμήχανον γάρ, ἅ τις εἰδέναι οἴεται, ταῦτα ἄρξασθαι μανθάνειν.

More information about this quote

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Original Citation

Epictetus. Ἐπικτήτου διατριβαί, Epiktētou diatribai [The Discourses of Epictetus]. c. 108, bk 2, ch 17.

Current Citation

Epictetus. "The Discourses." Discourses and Other Writings, edited and translated by Robert Dobbin. Penguin Classics, 2008, bk. 2, ch. 17.