Nicolaus Copernicus

To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.
To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.
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These are some quotes by Polish author Nicolaus Copernicus Scientist, who lived between February 19, 1473 and May 24, 1543.