Worry is like a rocking chair; it gives you something to do but it doesn’t get you anywhere. Behavioral psychologists have said this about worry: 40 percent of what we worry about never happens; 30 percent has already passed and worry can’t change it; 12 percent is needless worry about health; and 10 percent of the things we worry about are miscellaneous matters that don’t deserve worry. Only about 8 percent of the things that remain could be counted worthy of worry, but those could be divided into two categories: those you can do something about and those you can’t.