理论不应该试图解释所有事实，因为有些事实是错误的。
A theory should not attempt to explain all the facts, because some of the facts are wrong.
We are all in the gutter, but some of us are looking at the stars.
The beauty of mathematics lies in its ability to reveal hidden symmetries and truths.
"Your most unhappy customers are your greatest source of learning."
It is much easier to change how you think by changing your behavior， than it is to change your behavior by changing how you think. Act out the change you seek.
"A book is a small miracle."
我不喜欢依赖任何人，我有很强的自尊心。