Years ago, a penniless philosopher was wandering through a stony country where the people had a hard time making a living. One day a crowd gathered about him on a hill, and he gave what is probably the most-quoted speech ever delivered anywhere at any time. This speech contains twentysix words that have gone ringing down across the centuries: "Take therefore no thought for the morrow; for the morrow shall take thought for the things of itself. Sufficient unto the day is the evil thereof."