"The happiness of your life depends upon the quality of your thoughts."
"Most of what we say and do is not essential. If you can eliminate it, you'll have more time, and more tranquillity. Ask yourself at every moment, 'Is this necessary?'"
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Source: Marcus Aurelius, Plato, Aristotle (2012). “The Modern Library Collection of Greek and Roman Philosophy 3-Book Bundle: Meditations; Selected Dialogues of Plato; The Basic Works of Aristotle”, p.139, Modern Library
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