“No concrete test of what is really true has ever been agreed upon.”

—  William James , The Will to Believe and Other Essays in Popular Philosophy

Source: "The Will to Believe" p. 15 http://books.google.com/books?id=Moqh7ktHaJEC&pg=PA15
Source: 1890s, The Will to Believe and Other Essays in Popular Philosophy (1897)

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William James 246
American philosopher, psychologist, and pragmatist 1842–1910

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