实现明天的唯一限制是我们今天的疑虑。
To be human is to be vulnerable.
"To understand the present, we must first understand the past."
Man is an animal that makes bargains: no other animal does this—no dog exchanges bones with another.
人是会讨价还价的动物：没有其他动物会这样做——没有狗会与另一只狗交换骨头。