In philosophy, rationalism is the epistemological 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", often in contrast to other possible sources of knowledge such as faith, tradition, or sensory experience. More formally, rationalism is defined as a methodology or a theory "in which the criterion of truth is not sensory but intellectual and deductive".

Leo Strauss was a 20th century German-American scholar of political philosophy. Born in Germany to Jewish parents, Strauss later emigrated from Germany to the United States. He spent much of his career as a professor of political science at the University of Chicago, where he taught several generations of students and published fifteen books.