Let us take an example. A person has two feet. If one asks which of them is the chief foot: for ritual acts we do observe a distinction between right and left, but for walking, and for the pains the body suffers, are not both his own? Whichever foot is struck, is it not the person who has those feet who feels the pain? Whichever leg is hurt, it is he himself who suffers. So no one wishes pain on either leg; no one would consent to either leg being hurt. How, then, can anyone say which leg is the chief one and which is not? It is both feet together that carry a man along as he walks.