The best time to plant a tree was 20 years ago; the second best time is now.
种树的最佳时间是20年前；第二好的时间就是现在。
No man really knows about other human beings. The best he can do is to suppose that they are like himself.
Don’t ask yourself what the world needs. Ask yourself what makes you come alive and then go do that， because what the world needs is people who have come alive.
Small-scale farmers are the backbone of this industry; their knowledge is invaluable.
A good system design is one that makes it easy to do the right thing and hard to do the wrong thing.
一个好的系统设计是使做正确的事情变得容易，做错误的事情变得困难。
经济理论提供工具，但现实世界的测试会完善它们。