Man is made of opinions,?of truth and error; and his life is a warfare like all other lives before him…. Man goes on developing error upon error till he is buried in his own belief…. It is the office of wisdom to explain the phenomena in man called disease, to show how it is made, and how it can be unmade. This is as much a science as it is to know how to decompose a piece of metal. ~Phineas Parkhurst Quimby, December 1861