There are two types of strength and neither is automatic, but both are universally available. The first, called Fluid Intelligence, launches our adult mission fueled by passion, concern, talent, and intuition. In his best-selling book, Strength to Strength, Arthur Brooks illustrates how fluid intelligence offers early recognition, validation, and confidence. The problem is that fluid intelligence leaves us sooner than we want or realize (typically, in our late 30’s). So, what initially validates...