Ken Sande, The Peacemaker : A Biblical Guide to Resolving Personal Conflict, Baker Books, 3d ed., 2004, p. 102.
The root cause of conflict unmet desires in our hearts. When we want something and feel that we will not be satisfied unless we get it, that desire starts to control us. If others fail to meet our desires, we sometimes condemn them in our hearts and fight harder to get our own way.
Ken Sande, The Peacemaker: A Biblical Guide to Resolving Personal Conflict, Baker Books, 3d ed., 2004, p. 102.