我们今天种下的每一粒种子都是对后代的承诺。

我们听到的言语是我们听不到的暗示。

看东西只有用心才能看得清楚，重要的东西用眼睛是看不见的。

The historian must have some kinship with his subject. The dead will not speak unless they are properly addressed.

科学的进步不是一条直线，而是一个螺旋，总是在前进，又总是回到起点。

写作是一种逃离世界的方式，也是一种拥抱世界的方式。

You cannot hope to build a better world without improving the individuals. To that end, each of us must work for our own improvement and, at the same time, share a general responsibility for all humanity, our particular duty being to aid those to whom we think we can be most useful.