人类需要悲伤，正如需要欢乐一样。

The Liskov Substitution Principle is a fundamental concept in object-oriented programming, ensuring that derived classes can be used in place of their base classes without altering the correctness of the program.

To write is to give voice to the voiceless.

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

"Don’t try to make life a mathematics problem with yourself in the center and everything coming out equal. When you’re good, bad things can still happen. And if you’re bad, you can still be lucky."