" Don’t misunderstand,” Yusuf added. “Despite our best efforts, we may find that some battles are unavoidable. Some around us will still choose war. May we in those cases remember what we learned from Saladin: that while certain outward battles may need to be fought, we can nevertheless fight them with hearts that are at peace. “And may we remember the deeper lesson as well: that your and my and the world’s hoped-for outward peace depends most fully not on the peace we seek without but on the peace we establish within. "

― The Arbinger Institute , The Anatomy of Peace: Resolving the Heart of Conflict