The philosopher Socrates about to take poison hemlock as ordered by the court. Philosophy is the discipline concerned with questions of how one should live (ethics); what sorts of things exist and what are their essential natures (metaphysics); what counts as genuine knowledge (epistemology); and what are the correct principles of reasoning (logic).[1][2] The word is of Greek origin: f???s?f?a (philosophía), meaning love of wisdom.[3]