“Half asleep, he wondered whether that might not have been his happiest day ever, the last, perfect day swelling with the immensity of his secret intent, secret creation—the day before everything changed—the day before he realized, for the first time, yet with absolute finality, just how small his private immensity really was when measured against that other vast, dark, impersonal immensity, call it God, or history, or simply life.”