Essentials of Change
"Acting man is eager to substitute a more satisfactory state of affairs for a less satisfactory. His mind imagines conditions which suit him better, and his actions aim at bringing about this desired state. The incentive that impels a man to act is always some uneasiness. A man perfectly content with the state of his affairs would have no incentive to change things. He would have neither wishes nor desires; he would be perfectly happy. He would not act; he would simply live free from care" (Ludwig von Mises, in "Human Action: A Treatise on Economics." New Haven, Conn.: Yale University Press, 1949, p. 13)