"It is impossible for a man to learn what he thinks he already knows."
"You ought to choose both physician and friend, not the most agreeable, but the most useful."
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Source: Epictetus, George Long (2004). “Enchiridion”, p.52, Courier Corporation
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"Any person capable of angering you becomes your master."
"Happiness and freedom begin with a clear understanding of one principle: Some things are within our control, and some things are not. It is only after you have faced up to this fundamental rule and learned to distinguish between what you can and can't control that inner tranquility and outer effectiveness become possible."
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