Everyone must leave something behind when he dies, my grandfather said. A child or a book or a painting or a house or a wall built or a pair of shoes made. Or a garden planted. Something your hand touched some way so your soul has somewhere to go when you die, and when people look at that tree or that flower you planted, you're there. It doesn't matter what you do, he said, so as long as you change something from the way it was before you touched it into something that's like you after you take your hands away.
Ray Bradbury, Fahrenheit 451