有成就感的人会把世界看成一个友好的世界，并乐于看到它照原样保持下去，但失意者却会乐于看到世界急遽改变。

Gratitude is an antidote to negative emotions, a neutralizer of envy, hostility, worry, and irritation.

"Illustrations are not just decorations; they are an integral part of the storytelling."

译文：一心想完成替君主收复国家失地的大业，争取生前死后都留下为国立功的美名。可叹如今满头白发已经丛生!

Persistence is key in mathematical research; many great results come from looking at the same problem from different angles over and over again.

大多数人害怕变化，但如果你把它看成是某种你总是可以依赖的东西的话，那它就能成为一种安慰。世上你能依赖的东西并不是很多。