This is the true joy in life, the being used for a purpose recognized by yourself as a mighty one: the being thoroughly worn out before you are thrown on the scrap heap, and being a force of nature instead of a feverish selfish little clod of ailments and grievances, complaining that the world will not devote itself to making you happy.

George Bernard Shaw, quoted in Courage: You Can Stand Strong in the Face of Fear, Jon Johnston, 1990, SP Publications, p. 171.