You know if good and evil didn't have purpose, do you think god would allow it?  Then again genesis 3:22 does tell us that  Now man has become like one of us having eaten from the tree if knowledge, surely now he cannit eat from the tree of life and live forever. What kind of fruit does that tree of life have anyway and how exactly is it different to the other tree.  That's what i for one and one for all would like to know.