The only real knowledge is self-knowledge.

"The world is full of stories, but it is the ones we choose to tell that define us."

经过无数代人的努力，你才达到了现在的水平。也许需要一点感激之情。如果你要坚持让世界按你的方式弯曲，你最好有自己的理由。

不要去跟随已经有的道路，去探索没有被开拓的新道路，留下自己的足迹。

数学的乐趣在于发现的旅程，而不仅仅是目的地。

I want my books to be a mirror, not a window.

Well-being cannot exist just in your own head. Well-being is a combination of feeling good as well as actually having meaning, good relationships and accomplishment.