“Another example: When you watch a young child who is playing with complete focus and yet totally carefree, it’s hard not to feel a tug. Doesn’t the child’s innocence seem palpable at that moment? Can’t you feel in yourself—or yearn to feel—the same delight in play? Doesn’t the child’s tiny body seem as fragile as a soap bubble and yet bursting with life itself, something immense, eternal, never to be defeated?”