You can‘t reason someone out of a notion that they didn’t reason themselves into. 

"Maybe you can afford to wait. Maybe for you there’s a tomorrow. Maybe for you there’s one thousand tomorrows, or three thousand, or ten, so much time you can bathe in it, roll around it, let it slide like coins through your fingers. So much time you can waste it. But for some of us there’s only today. And the truth is, you never really know."

成为英雄的最大障碍是怀疑自己是否会证明自己是个傻瓜；真正的英雄主义是抵制这种怀疑；最深刻的智慧是知道何时应该抵制，何时应该服从。

在数学中，坚持往往比才华更重要。

世界是一本书，不旅行的人只读了一页。

没有坚强意志品质的人学识智慧也不会通达;不遵守诺言的人行动也不会实现。