城市的穷人就像树的根：看不见，但对生存至关重要。

行为是行为发生时场域的函数。

增长来自于拥抱变化，而非抗拒变化。

I never write Metropolis for seven cents because I can get the same price for city. I never write policeman because I can get the same money for cop.

思想之流即生存之流。

The best way of learning about anything is by doing.