“All we can know is that we know nothing. And that's the height of human wisdom.”

—  Leo Tolstoy , book War and Peace

Variant: The only thing that we know is that we know nothing — and that is the highest flight of human wisdom.
Source: War and Peace (1865–1867; 1869), Ch. I

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Leo Tolstoy 456
Russian writer 1828–1910

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