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In every case the story opens with a perfect state of Yin. Faust is perfect in knowledge; Job is perfect in goodness and prosperity; Adam and Eve are perfect in innocence and ease; the Virgins— Gretchen, Danae and the rest— are perfect in purity and beauty. In the astronomer’s universe the Sun, a perfect orb, travels on its course intact and whole. When Yin is thus complete, it is ready to pass over into Yang.
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Arnold J. Toynbee (A Study of History, Abridgement of Vols 1-6)