We love and care for oodles of people, but only a few of them, if they died, would make us believe we could not continue to live. Imagine if there were a boat upon which you could put only four people, and everyone else known and beloved to you would then cease to exist. Who would you put on that boat? It would be painful, but how quickly you would decide: You and you and you and you, get in. The rest of you, goodbye.