Pythagoras (fl. 500 B.C.E.), the first man to call himself a philosopher, was both a brilliant mathematician and spiritual teacher. This anthology, the largest collection of Pythagorean writings ever to appear in the English language, contains the four ancient biographies of Pythagoras and over 25 Pythagorean and Neopythagorean writing from the Classical and Hellenistic periods. The Pythagorean ethical and political tractates are especially interesting, for they are based on the premise that the universal principles of Harmony, Proportion and Justice govern the physical cosmos, and these writings show how individuals and societies alike attain their peak of excellence when informed by these same principles.