" The laws of physics apply to everything equally, to stars as well as flowers. Botany and astronomy are separate sciences, but if they are somehow fundamentally inconsistent then there is something wrong with our theories. The need for such an all-encompassing vision was not really felt in the Classical past. Aristotle wrote very widely and was happy enough to draw analogies between disparate phenomena, but he was conspicuously silent on some topics (such as what we would now call chemistry) and gives little impression of the need for congruence and continuity. For encyclopedists such as Pliny, "local" explanations for things were often enough: phenomena are explained largely in terms of themselves, not in terms of other things. Where do the four humors, the bodily fluids that were thought to govern health, come from? Neither Galen nor Hippocrates, the two preeminent physicians of antiquity, tell us; they assume that it is just how things are. "

― Philip Ball , The Devil's Doctor: Paracelsus and the World of Renaissance Magic and Science