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A fascinating collaboration between a medieval historian and a professor of psychiatry, this enthralling book applies modern biological and psychological research findings to the lives of medieval mystics and ascetics. Drawing upon a database of over…

Why is the number seven lucky--even holy--in almost every culture? Why do we speak of the four corners of the earth? Why do cats have nine lives (except in Iran, where they have seven)? From literature to folklore to private superstitions, numbers…