Human life has always been lived on the edge of a precipice. Human culture has always had to exist under the shadow of something infinitely more important than itself. If men had postponed the search for knowledge and beauty until they were secure, the search would never have begun…. They wanted knowledge and beauty now, and would not wait for the suitable moment that never comes…. They propound mathematical theorems in beleaguered cities, conduct metaphysical arguments in condemned cells, make jokes on scaffolds, discuss the last new poem while advancing to the walls of Quebec, and comb their hair at Thermopylae. This is not panache; it is our nature.