When does a life worth living cease to become so? When one can no longer eat and must use a feeding tube? A ventilator? When one loses mobility, or memory? What about pain—can one live with a little, but not a lot? How much is a lot, exactly? And then there is the monster in its own category that is depression. I know many people living with each of these conditions, and the thing I know is this: the view from outside is invariably impoverished. The human brain just lacks the imagination to fathom a life lived well that is so physically or neurologically different from one’s own. Living without capacities one has come to take for granted is only seen as loss of capacity, and therefore loss in total. A life no longer a life. But ask disabled people, and they will tell you: their lives are worth having.