"[C]rafts—the development of techniques designed to serve human activity; and rituals—the attempt to control the powers of Nature, not only for comfort and convenience, but rather so that man shall live in harmony with the cosmic order... So far as we know, these represented the whole of man's understanding of the material world, until about the year 600 B.C. After that time, we find a parallel, intellectual tradition growing... with very different aims... eventually re-applied for practical ends..."