Simple can be harder than complex: You have to work hard to get your thinking clean to make it simple.

The most beautiful as well as the most ugly inclinations of man are not part of a fixed biologically given nature, but result from the social process which creates man.

随着年龄增长，我越发意识到自己知之甚少。

预测未来的最好方法就是创造未来。

变得快乐的技巧几乎完全不同于不悲伤的技巧。