Living in Paris for a winter and a spring and waking each morning to a view of Notre Dame, David Oates is led to revise his life story from one of trudging and occasional woe into one punctuated by nourishing and sometimes unsettling brilliance. He asks: What is the meaning of this tremendousness? In long years of mountaineering Oates fought the self-loathing that had infused him as the gay kid in the Baptist pew. And in The Mountains...