"A smile. It costs nothing, but means so much. It enriches those who receive it, without impoverishing those that give it. It happens in a flash, but sometimes the memory lasts forever. None are so rich that they can get on without it, and none so poor but are right for its benefits. It is rest to the weary, daylight to the discouraged, sunshine to the sad and nature's best antidote in times of trouble. Yet it cannot be bought, borrowed or stolen, for it is something that is no earthly use to anyone unless given away. And if, in the rush of business, a man is too tired to give you one, then leave one of yours, for no one needs a smile so much as those who have none to give."