I’m the least fanciful guy around, but on nights when I...

I’m the least fanciful guy around, but on nights when I wonder whether there was any point to my day, I think about this: the first thing we ever did, when we started turning into humans, was draw a line across the cave door and say: Wild stays out. What I do is what the first men did. They built walls to keep back the sea. They fought the wolves for the hearth fire.