我相信书籍有改变生活的力量。
学习数学的最好方法就是做数学。
The farmer is the only man in our economy who has to buy everything at retail, sell everything at wholesale, and pay the freight both ways.
也许宇宙中最反直觉的真理是:你给别人的越多,你得到的也越多。了解这一点是智慧的开始。