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To know that we know what we know, and that we do not know what we do not know, that is true knowledge.

This quote is about knowledge

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A bit about Henry David Thoreau ...

Henry David Thoreau (July 12, 1817 - 1862) was an American essayist, poet, and naturalist. Among his lasting contributions were his writings on natural history and philosophy, where he anticipated the methods and findings of ecology and environmental history, two sources of modern day environmentalism.

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