Emile was not born to live alone, he is a member of society, therefore, he must also fulfill his obligations to society.He was going to live among people in the future, so he had to know something about them.In general, he already knew something about human beings.As for the individual, he still needs to learn and understand.He knows what is going on in the world, and now, what he wants to know is how people live in this world.Now is the time, before taking him on the stage of this vast world, he has already understood the hidden work of the world, and now let him see the front stage.Such a scene would not make him dizzy with admiration like a rash young man, but would discern the precise, quintessential spirit in it.