When men are most sure and arrogant they are commonly most mistaken， giving views to passion without that proper deliberation which alone can secure them from the grossest absurdities.
Never underestimate the power of incremental improvements.
The key ingredients of happiness could not be material or aesthetic, but must always stubbornly psychological.
The best way to learn mathematics is to do mathematics.
成功不是成为房间里最聪明的人，而是激发他人的最佳潜能。
一个人真正的财富是他的记忆。除此之外，他既不富有也不贫穷。