"The game of life is a boomerang," says the optimistic author Barbara Johnson in Boomerang Joy, a collection of 60 brief devotional essays. Johnson contends that our thoughts, deeds, and words return to us sooner or later with astounding accuracy. If you initiate joy, if you learn to "fling a smile a mile," Johnson promises that the happiness you send out will return to you "more accurately each time you toss it out."