The true challenge in mathematics is not solving problems, but asking the right questions.
I wonder how many people I've looked at all my life and never seen.
The only limit to our realization of tomorrow is our doubts of today.
真相往往隐藏在显而易见之处。
成功不是被给予的,而是赢得的。
It's not about how much you have, but how much you enjoy what you have.