"The hardest thing in life is to know which bridge to cross and which to burn."
人生最难的是知道该跨过哪座桥，又该烧掉哪座桥。
理解的提高有两个目标：首先，我们自己的知识增长；其次，使我们能够将这些知识传递给他人。
相对论不仅是一项科学成就，更是一种关于空间和时间的新思维方式。
我们都在阴沟里，但仍有人仰望星空。
The founders of a new colony, whatever Utopia of human virtue and happiness they might originally project, have invariably recognized it among their earliest practical necessities to allot a portion of the virgin soil as a cemetery, and another portion as the site of a prison.