One day, the Devil decided to go out of business. His tools, therefore, being for sale, were put on display; and Malice, Jealousy, and Pride were soon recognized by most of his prospective customers. There was one worn, tiny wedge-shaped tool bearing the highest price, however, which seemed difficult to identify. "What is that?" someone asked. "I can't quite place it." "Oh that!" Satan answered. "That is Discouragement. It is my most valuable tool. With it I can open many hearts, since so few people know that it belongs to me."
Source: Three Minutes by James Keller, M. M., 1950
Contributed by: Zaady