"On his thirty-first birthday, Lewis wrote, in a famous passage, "This day I completed my thirty first year. . . . I reflected that I had as yet done but little, very little indeed, to further the hapiness of the human race, or to advance the information of the succeeding generation. I viewed with regret the many hours I have spent in indolence, and now soarly feel the want of that information which those hours would have given me had they been judiciously expended." He resolved: "In future, to live for mankind, as I have heretofore lived for myself."5"