“It is impossible for a man to learn what he thinks he already knows.”
More from Epictetus
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“One that desires to excel should endeavor in those things that are in themselves most excellent.”
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“Men are disturbed not by things, but by the view which they take of them.”
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“Not every difficult and dangerous thing is suitable for training, but only that which is conducive to success in achieving the object of our effort.”
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“Make the best use of what is in your power and take the rest as it happens.”
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“If you seek truth, you will not seek victory by dishonorable means, and if you find truth you will become invincible.”