True history is a finite set: everything that has happened is fixed in the dust, immutable. The future, however, is an infinite set—time forever branches, leading toward wildernesses yet unvisited. The marvelous thing is this: as we walk into the infinite, the only luggage we carry with us is that finite history. We use the entirety of our past to unlock a future without answers. This, perhaps, is the place where humans are most lonely—and most brave. 真实的历史，是一个有限集，所有发生过的，都已被尘埃固定。而未来，是一个无限集，时间永远分叉，通向未曾抵达的旷野。 奇妙的是：我们走向无限时，身上唯一的行李，却是那有限的历史。 我们用过去的全部，去打开一个没有答案的未来。这大概就是人最孤独，也最勇敢的地方。