Look at me.We all have marks on our face. I have this wrinkle here from your first surgery.I have these wrinkles here from your last surgery. This is the map that shows us where we’ve going.And this is the map that shows us where we’ve been.And it’s never ever ugly.

Memory is a trickster, always rewriting the past.

最大的荣耀不在于永不跌倒，而在于每次跌倒后都能站起来。

We must listen to our customers—they are the reason we exist.

数学的本质不仅在于解决问题，还在于提出正确的问题。

写作的艺术是发现自我的艺术。