On replacing pain

 Doctors have actually tried to replace pain in the human body with some other kind of warning system. It doesn't work. The philosopher David Hume said that God could have given us something less unpleasant than pain in order to warn us the way pain does but is less unpleasant. I remember talking to someone who did pain research but who was going into philosophy, and he told me that the work of pain can't be done without the awfulness of pain.