Writer and lecturer Dale Carnegie once said: “Life truly is a boomerang. What you give, you get.” Last year, I missed the birthday of an 8-year-old grandson. Having noticed on a recent visit to his home that he enjoyed driving nails into a board, I sent him an age-appropriate toolbelt and tools I’d found online. That unexpected gift prompted a phone call from a kid bursting with excitement. We talked for a few minutes while he described each tool, and I got off the phone suffused with the happiness he’d shared. There was that boomerang. Giving to others brings gifts in return. For one thing, giving takes us out of what can be the prison of the self. Ours is a culture in which we can become obsessed with that self. We see therapists, hoping to find a key to unlock that prison door, we read self-help books, seeking relief …