Have you ever felt unsatisfied, let down, even inexplicably empty, after you got what you thought would make you happy? You’re not alone. This perplexing feeling has been known to strike the most accomplished and wealthy people as well as the less accomplished and less wealthy. In fact, King Solomon had it all—a kingdom, untold wealth, and profound wisdom and knowledge—yet after pondering his life, he said that there was nothing new under the...