有时人生最困难的事是知道该跨过哪座桥，烧掉哪座桥。
"Sometimes the hardest thing in life is to know which bridge to cross and which to burn."
"The colony is the place where the project of a new humanity is to be tested, where the dream of a world without borders is to be realized, where the dream of a world without races is to be realized, where the dream of a world without nations is to be realized, where the dream of a world without classes is to be realized, where the dream of a world without genders is to be realized, where the dream of a world without religions is to be realized, where the dream of a world without money is to be realized, where the dream of a world without property is to be realized."
你必须对自己所做的事情充满热情，否则就不值得去做。
The study of mathematics is the indispensable basis for all intellectual and spiritual progress.