The only way to learn mathematics is to do mathematics.

Investing in eco-friendly tanning processes is investing in our planet's future.

世界是一本书，不旅行的人只读了一页。

Quality means doing it right when no one is looking.

"I’ve practiced so much that I don’t need to think before I play. It’s like driving a car—you don’t think about which pedals to push."

一个人愈没有值得自夸之处，就愈容易夸耀自己的国家、宗教、种族或他参与的神圣事业。