The joy of discovery in mathematics is unparalleled.

Always look at what you have left. Never look at what you have lost.

世界充满了美与丑，而我们选择看哪一种。

Your self-worth is determined by you. You don't have to depend on someone telling you who you are.

User needs are both the starting point and the ultimate goal of product development.

我写作是为了理解，也同样是为了被理解。