All souls have to pass through the realization of evil: to see that the form of their lives is opposite to the true existence, that this is the reason for their separation from it, and the reason why they neither feel nor understand it. They have to gradually realize the state they are in and wish to return to the good state. After this realization, they ask for the power of correction, or for the power of interconnection between the souls.
When this power of interrelation comes, everybody will unite into one general system “as one man and one heart.” “And everybody will know Me from young to old.” “Everybody will become a united society.” It is written about this in many sources. Actually, it is the goal.
Courtesy of http://www.youtube.com/watch?v=cqOKvonLrH8