Dickens isn't simply praising kindness—he's redefining usefulness itself, suggesting that a life's value has nothing to do with productivity, status, or achievement. Most of us measure worth by what we accomplish or accumulate, but he's asking us to look sideways at the quieter acts: the friend who listens when you're exhausted, the nurse who holds a patient's hand, the coworker who takes on a tedious task so someone else can breathe. A parent staying home to care for an aging parent might feel invisible to the world's accounting books, yet by this measure, they're among the most essential people alive. It's a radical permission slip to matter without needing permission from anyone's scoreboard.