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

教学的艺术不在于传授本领，而在于激励、唤醒和鼓舞。

Fear of imprisonment soul, hope you free.

不算过错，有多少人为此蒙蔽良心；无可奈何，有多少体面以此为借口。

"Books are the keys to understanding the world and ourselves."

The beauty of mathematics is that it allows us to abstract away the complexities of the real world and focus on the underlying principles.

The biggest lie we tell ourselves is “I don‘t need to write this down because I will remember it.”