Aristotle and Descartes
Aristotle bases his philosophical program on the study of nature, and specifically the changes objects in nature are able to undergo. This is opposed to his metaphysics, which is only able to come afterward, as it broadly addresses all possible beings, and not just those found wholly in nature. We might at first seem definitively capable of studying these changes in natural things by comparison to the seemingly far more speculative metaphysical objects, which we do not find so clearly in the world all around us....