"It is impossible for a man to learn what he thinks he already knows."
"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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Source: Epictetus, Sharon Lebell (2013). “The Art of Living: The Classical Mannual on Virtue, Happiness, and Effectiveness”, p.3, Harper Collins
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