I don’t regret the things I’ve done, I regret the things I didn’t do when I had the chance.
过去是一个异国他乡;那里的人们做事方式不同。
Rigor in proof is what separates mathematics from all other sciences.
解释:如果自己都不尊重自己,那么危险和侮辱就会接踵而至。