把这一句，留给此刻的你
These are matters of external history. They are indeed prominent objects, often changing and giving a new direction to the current; but they tell us not why it flows onward and will ever flow.
这些都是外部历史问题。它们的确是突出的物体，经常改变潮流，给潮流指明新的方向;但它们没有告诉我们，为什么它会向前流动，而且永远会向前流动。