对称性不仅是自然的一种属性，而且是寻找物理定律的指导原则。
最深刻的定理往往源于最简单的观察。
The unexamined life is not worth living.
Remembering that I'll be dead soon is the most important tool I've ever encountered to help me make the big choices in life. Because almost everything - all external expectations, all pride, all fear of embarrassment or failure - these things just fall away in the face of death, leaving only what is truly important.
Simplicity has a way of improving performance by enabling us to better understand what we are doing.
简洁有一种提高绩效的方法，它能让我们更好地理解我们正在做的事情。
"I believe that every child is an artist. The problem is how to remain an artist once we grow up."