实现明天的唯一限制就是我们今天的怀疑。

The greatest discovery of my generation is that a human being can alter his life by altering his attitudes.

The snake has to shed his skin before he can grow.

如果流动，就流走；如果静止，就干涸；如果生长，就慢慢凋零，这个世界没有永恒。