He was unaffected by the singularities of time and place. His abode was anywhere. It was all the same to him whether he catheterized a pig at four o’clock in the afternoon in New Orleans or at midnight in Transylvania. . . . Yet I do not envy him. I would not change places with him if he discovered the cause and cure of cancer. For he is no more aware of the mystery which surrounds him than a fish is aware of the water it swims in.