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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Nicolaus Copernicus was a Renaissance-era mathematician and astronomer. He is best known for his heliocentric model of the universe, which placed the Sun, rather than Earth, at the center of the solar system. His groundbreaking work laid the foundation for modern astronomy and revolutionized our understanding of the cosmos.
1473–1543·lived 70 years
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.