In mathematics, you don't understand things. You just get used to them.

当思想掌握了群众，它就成为一种物质力量。

In the midst of difficult times， it is our response that defines us， not the circumstances.

时间是最好的作者：总能找到一个完美的结局。

最可持续的建筑是已经建成的建筑。