" The four major branches of philosophy – metaphysics (the study of reality); epistemology (the study of knowledge); politics (the study of state power); and ethics (the study of virtue) – are like the plumbing that delivers water to your sink. Aqueducts, sewers, piping – these all only have value insofar as they enable you to turn on a tap in your house and actually get some clean water. Metaphysics, "

― Stefan Molyneux , Essential Philosophy: How to know what on earth is going on