可持续性不是一种趋势，而是一种责任。

人民是革命的根基。没有人民，革命就不能成功。

The footsteps of Nature are to be traced, not only in her ordinary course, but when she deviates from it in her most extravagant excursions.

The world is a complicated place, and I try to reflect that in my writing.

Productive thinking is characterized by the sudden appearance of the solution as an insight.

A long habit of not thinking a thing wrong gives it a superficial appearance of being right.

学会忍耐的人，会把全世界称为兄弟。