Sentence:  Of all the stories that fuel conflict, none affects you more than your <WSD>"mythos</WSD> of identity"—the core narrative that shapes how you see your identity in relation to that of the other side. In a conflict, you are likely to regard yourself as the victim and the other as the villain. You fill in the details of this <WSD>mythos</WSD> with personal grievances and accusations. Of course, the other side also sees the conflict through a <WSD>mythos</WSD>—and in theirs "they" are the victim. Unless you transform the fundamental way you relate to each other—your <WSD>mythos</WSD>—your conflict will remain. 
Meaning of the word marked with <WSD> tags:  A set of assumptions or beliefs about something.