世界的进步，部分依赖于那些未被历史记载的行为；你我如今的处境还不至于太糟，有一半要归功于那些默默无闻、忠诚生活，并长眠于无人祭扫的坟墓中的人们。
The growing good of the world is partly dependent on unhistoric acts; and that things are not so ill with you and me as they might have been, is half owing to the number who lived faithfully a hidden life, and rest in unvisited tombs. ― George Eliot, Middlemarch
解读：这是诙谐调侃，意在缓解人们自我否定时的低落情绪，用幽默方式鼓励换个视角看自己，重拾轻松心态。
The best way to solve a problem is to think about it in a different way.
A coward is incapable of exhibiting love； it is the prerogative of the brave.
Dont keep making the same mistakes; try to make new mistakes.
研究学习的唯一有意义的方法是通过客观测量。