4 definitions
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Invention (n.) is immortal — What was once thought can never be unthought.
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The Paradox (n.) is the essence of reality — He who confronts the paradoxical exposes himself to reality.
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Planning (n.) is making oneself vulnerable — The more human beings proceed by plan the more effectively they may be hit by accident.
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Thought (n.) is immortal — What was once thought can never be unthought.