"It is impossible for a man to learn what he thinks he already knows."
"Never call yourself a philosopher, nor talk a great deal among the unlearned about theorems, but act conformably to them. Thus, at an entertainment, don't talk how persons ought to eat, but eat as you ought. For remember that in this manner Socrates also universally avoided all ostentation."
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Source: Epictetus (2012). “The Handbook of Epictetus”, p.17, Simon and Schuster
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