纪念碑是变化城市中的一个固定点。

做得越多，学得越多；学得越多，能做的就越多。

The world is what it is; men who are nothing, who allow themselves to become nothing, have no place in it.

The cognitive map is not a picture or a model in the head, but a dynamic, changing representation of the environment.

人是一个行走的存在，总是向前，寻找自己的命运。

我是一个美国黑人，我为我的种族感到骄傲。我为自己是谁感到骄傲。我有许多自豪和尊严。

It is remarkable how much long-term advantage people like us have gotten by trying to be consistently not stupid, instead of trying to be very intelligent.

责任感就是对自己责任的热爱。