学习数学的最好方法就是去做数学。
Live the life you love. Love the life you live.
The community is a fictitious body， composed of the individual persons who are considered as constituting as it were its members.
So given a Time Turner, I would tell my 21-year-old self that personal happiness lies in knowing that life is not a check-list of acquisition or achievement. Your qualifications, your CV, are not your life, though you will meet many people of my age and older who confuse the two. Life is difficult, and complicated, and beyond anyone’s total control, and the humility to know that will enable you to survive its vicissitudes.
文学教会我们用另一种眼光看世界，用另一种方式理解它。
In the end, we are all just stories.