爱是不够的，它需要被照料，像火一样。
Love is not enough. It has to be tended, like a fire.
I am not without possessions; I have freedom.
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
过去并非异国，而是我们自己。
In mathematics, the journey of discovery is as important as the destination.
宇宙是一个广阔而神秘的地方，我们才刚刚开始理解它的秘密。