Philosophy was born two centuries before Aristotle when Thales of Miletus predicted an eclipse. The Lydians and the Medes, locked in combat at the River Halys, looked to the suddenly darkened sky and ended their warfare, declaring the river the border between their two nations. As the light returned to the sky, so was a light enkindled on earth — albeit a light of a very different kind: changes in the world — and even changes in the sky — were not the arbitrary will of the gods. They were, on the contrary, governed by an inviolable order — and, when a man came to understand that order, he could predict them. For the first time in human history, a man had traded the subjective for the objective — seeing the world not from within the perspective of a given moment but rather from that of the eternal. For the first time in human history, a man had become as a god — had stolen the divine fire of knowledge of things as they will be. Though it would, in the darker ages to come, dim considerably, this fire would never again go out.