The foundation of every government is some principle or passion in the minds of the people.
The only constant is change, continuing change, inevitable change, that is the dominant factor in society today. No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be.
人是万物的尺度:对于存在的事物,它们存在;对于不存在的事物,它们不存在。