对一项神圣事业的信仰相当程度上替代了已经失去的自信。

The deep, personal material of the latter half of your life is your children. You can write about your parents when they're gone, but your children are still going to be here, and you're going to want them to come and visit you in the nursing home.

理解黑洞就是理解宇宙的结构本身。

The best books are the ones that children want to read again and again.

爱是一种极其困难的领悟：除了自己之外还有其他真实存在。

【译文】 孔子说：“有益的朋友有三种，有害的朋友有三种。与正直的人交朋友、与诚实的人交朋友、与见多识广的人交朋友，有益处；与走邪门歪道的人交朋友、与谗媚奉迎的人交朋友、与花言巧语的人交朋友，有害处。”

大脑当然被锁在完全的黑暗中，孩子们，就是这样构建的，但心灵，心灵充满了光。