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.
Scientists
Nicolaus Copernicus
Polish astronomer born in 1473 whose De revolutionibus proposed heliocentrism, overturning fourteen centuries of Ptolemaic geocentrism and launching the revolution that led to Kepler and Newton.
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Nicolaus Copernicus's Other Quotes
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