When you have nobody you can make a cup of tea for, when nobody needs you, that's when I think life is over.

The best solutions come from listening to those who work the land every day.

A man should always consider how much he has more than he wants.

每种心理状态都有其存在的目的；要理解它，我们必须询问它在更广泛的行为系统中发挥什么功能。