理论上，理论和实践之间没有区别。但实际上，是有区别的。
In theory, there is no difference between theory and practice. But, in practice, there is.
困难不在于提出新观念，而在于摆脱旧观念。
I write to remember, to not let the past slip away.
经济进步既依赖于新想法，也依赖于更好的实施。
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
善恶之间的界限常常是模糊的。