To begin with, by undertaking acts of voluntary discomfort—by, for example, choosing to be cold and hungry when we could be warm and well fed—we harden ourselves against misfortunes that might befall us in the future. If all we know is comfort, we might be traumatized when we are forced to experience pain or discomfort, as we someday almost surely will. In other words, voluntary discomfort can be thought of as a kind of vaccine:
