革命道德不是从天上掉下来的。它是在日常斗争中培养，在革命活动中锤炼的。

"The mind evolves to meet practical demands."

天籁，风吹万窍声音不同，都是自由自在地发声或停止，毋需外力的支配。

唯一真正的知识是自知之明。

Thank God, under our Constitution there was no connection between church and state.

The deepest theorems often arise from the simplest observations.

"Experience is simply the name we give our mistakes."

You cannot always control what goes on outside, but you can always control what goes on inside.

在任何情况下生存的最佳方法就是为之做好准备。