Sometimes you can do everything right and things will still go wrong. The key is to never stop doing right.
有时候你做了所有正确的事情,事情仍然会出错。关键是要永远不要停止做正确的事情。
The choice for mankind lies between freedom and happiness and for the great bulk of mankind, happiness is better.
Mathematics is the art of giving the same name to different things.
The only way to avoid being miserable is not to have enough leisure to wonder whether you are happy or not.