Men make their own history, but they do not make it as they please; they do not make it under self-selected circumstances, but under circumstances existing already, given and transmitted from the past.
人们自己创造自己的历史，但是他们并不是随心所欲地创造，并不是在他们自己选定的条件下创造，而是在直接碰到的、既定的、从过去承继下来的条件下创造。
Perspective is worth 80 IQ points.
可持续发展不是一种选择，而是我们对下一代的责任。