Just as there are laws of Conservation of Matter and Energy, so there are in fact Laws of Conservation of Pain and Joy. Neither can ever be created or destroyed. But one can be converted into the other.
Spider RobinsonTo all the Callahan's Places there ever were or ever will be, whatever they may be called — and to all the merry maniacs and happy fools who are fortunate enough to stumble into one: may none of them arrive too late!
Spider Robinson