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。
如果你不愿意学习，没人能帮你。如果你决心学习，没人能阻止你。
在变革时期，学习者将继承地球，而知识渊博的人会发现自己装备精良却面对一个不复存在的世界。
Given the choice between the experience of pain and nothing, I would choose pain.
意义来自于属于和服务于超越你自己的事物。
The universe is full of mysteries, and that’s what keeps scientists motivated.