Self-knowledge (n.) is acquired never by thinking, always by doing.
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Self-knowledge (n.) is acquired only through joy and sorrow, which teach us what to do and what to avoid.
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Self-knowledge (n.) is never possible by reflection, but only by doing.
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Self-knowledge (n.) is always incomplete. No one has ever learned fully to know themselves.
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Self-knowledge (n.) is best learned not by contemplation, but by action.
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Self-knowledge (n.) is impossible — we do not know ourselves and God forbids that we should.