You have to believe in yourself when no one else does.
革命是通过人类进行的,但个人必须日复一日地锻造自己的革命精神。
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.
The most important room in the house is the one you're in.
数学不是观赏性运动,你必须参与其中才能理解。