"Remember that the Divine rule is that we all need, as the Real One, to have free will. For that to occur, Fear will prepare for each event in our lives a message or explanation based on and fueling fear/separation, and Love will offer another perspective which tries to unify us."

"Only measure a story, message, or a life situation by the following criteria and make it the litmus test of evolution: If the situation brings you closer to Oneness, enter it and choose it. If it brings you closer to fear/separation, fear of lack, and elitism, please do not give it energy for it will grip your reality and manifest further. Remember you are the One, you are the only one granted free will."

The above are excerts from an article appearing here:
http://www.bloginservice.com/cgi-bin/webbbs/webbbs_config.pl/read/2267

The is a long article...read it anyway.
Mr. O'Donnell goes off on a few tangents of detail that I don't follow - but, in general, this is one of the best explanations for the existence and purpose of duality that I have read.