In any modern city, a great deal of our energy has to be expended in not seeing, not hearing, not smelling. An inhabitant of New York who possessed the sensory acuteness of an African Bushman would very soon go mad. W. H. Auden
Let one hour, the same regularly each day, be set aside for food, so that out of the twenty-four hours of day and night, barely shall this one be expended on the body, the ascetic devoting the remainder to the activities of the mind. Basil of Caesarea