正义意味着关心自己的事情，而不是干预别人的事务。

It seems to me that the natural world is the greatest source of excitement; the greatest source of visual beauty; the greatest source of intellectual interest. It is the greatest source of so much in life that makes life worth living.

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

幸福的门户就在你内心。