“If a man would pursue Philosophy, his first task is to throw away conceit. For it is impossible for a man to begin to learn what he has a conceit that he already knows.”
72
Golden Sayings of Epictetus
Variant: It is impossible for a man to learn what he thinks he already knows.
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Epictetus 175
philosopher from Ancient Greece 50–138Related quotes

“It is impossible for a man to learn what he thinks he already knows.”

“Every man has a right to be conceited until he is successful.”
The 'Advertisement' to the 1853 edition.
Books, Coningsby (1844), The Young Duke (1831)

Quia Imperfectum
And Even Now http://www.gutenberg.org/dirs/etext99/evnow10.txt (1920)

“For what are they all in their high conceit,
When man in the bush with God may meet?”
Good Bye
Bartlett's Familiar Quotations, 10th ed. (1919)
Variant: For what are they all in their high conceit,
When man in the bush with God may meet?

The Rosy Crucifixion I : Sexus (1949), Chapter 1. (New York: Grove Press, c1965, p. 17-18)

Kashf ul Asrar: translated by Ambreen Moghees Sarwari Qadri.
Kashf ul Asrār