the world into which Christianity came owed much to the specific influence of Greek thought. Hellenistic ideas dominated the intelligence of the Roman Empire, but their sway was extensive only among the more cultivated portion of the population. Greek philosophic speculation at first concerned itself with the explanation of the physical universe. Yet with Heraclitus of Ephesus (about B. C. 490), though all was viewed as in a sense physical, the universe, which is in constant flow, is regarded as
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