In epistemology, rationalism is the view that "regards reason as the chief source and test of knowledge" or "any view appealing to reason as a source of knowledge or justification". More formally, rationalism is defined as a methodology or a theory "in which the criterion of the truth is not sensory but intellectual and deductive". In an old controversy, rationalism was opposed to Empiricism, where the rationalists believed that reality has an intrinsically logical structure. https://en.wikipedia.org/wiki/Rationalism
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