年轻时，你以为长大后就会幸福。但长大后，你意识到年轻时的自己才是幸福的。
When you are young, you think you will be happy when you are older. But then you get older and you realize you were happy when you were young.
大道从虚无中产生一气，又从一气中分化出阴阳。
The choice for mankind lies between freedom and happiness and for the great bulk of mankind, happiness is better.
说话是一种冒险，但沉默是更大的冒险。
最好的设计源于理解使用者的需求。
The truth is a knife, and it cuts both ways.
The hardest single part of building a software system is deciding precisely what to build.