Daily Quotes
When our ideas on any subject, material, intellectual, or social, undergo a thorough change in consequence of new observations,...
Apr 08,2021
128
When our ideas on any subject, material, intellectual, or social, undergo a thorough change in consequence of new observations, I call that movement of the mind a revolution. If the ideas are simply extended or modified, there is only progress. Thus the system of Ptolemy was a step in astronomical progress, that of Copernicus was a revolution.
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