Physical life brings happiness, but mental life brings interest - a consuming, absorbing interest. How I pity that person, young or old, who cannot shut out the world, open a book, and go forth on an adventure of romance, travel, biography, history, or business. What a shame to see so many mental lives slow down after school days are over, just because people forget the necessity of everlasting studying if they expect to get anywhere. ~ William Danforth