Mathematics is not a spectator sport; you have to play to understand.
数学不是观赏性运动，你必须参与其中才能理解。
I’m a firm believer in the theory that you only get out what you put in.
The greatest proof of our intellect is our ability to perceive our own limitations.
I think it's important to have a positive attitude and to be optimistic.
生活就像过山车，活在当下，快乐，享受生活。
