Redefinition is a nightmare--we think we've arrived, in our nice Pottery Barn boxes, and that this or that is true. Then something happens that totally sucks, and we are in a new box, and it is like changing into clothes that don't fit, that we hate. Yet the essence remains. Essence is malleable, fluid. Everything we lose is Buddhist truth--one more thing that you don't have to grab with your death grip, and protect from theft or decay. It's gone. We can mourn it, but we don't have to get down in the grave with it.