合理的战略始于树立正确的目标。

There is no point treating a depressed person as though she were just feeling sad, saying, 'There now, hang on, you'll get over it.' Sadness is more or less like a head cold- with patience, it passes. Depression is like cancer.

学习数学的唯一方法就是做数学。

Every ending is a new beginning.

"The world is a book, and those who do not travel read only one page."