Milton's allusions

I felt like Milton's extended Adam and Eve metaphor was extremely powerful. 

The way I read it is that God placed something forbidden (the apple) in the world, thus creating a new classification system (the distinction between good and evil) that did not exist prior to this event. 

Milton compares this to the censorship of literature very eloquently. If what some consider to be evil was hidden or banned from society then we would no longer have a standard of what is considered to be righteous. 

Perhaps this is a misinterpretation, but I found it to be an interesting take on censorship nevertheless.