每个单子都反映了整个宇宙的角度，但有不同的深度和清晰度。
The truth is rarely pure and never simple.
The mind is a constantly evolving stream of experiences.
If one only wished to be happy, this could be easily accomplished; but we wish to be happier than other people, and this is always difficult, for we believe others to be happier than they are.
In mathematics, the art of proposing a question must be held of higher value than solving it.
你必须愿意失败，愿意犯错，愿意带着学到的教训重新开始。