Inspired by Jesus's words on the cross, Bettany Hughes traces the history of this challenging virtue. What does it really ask of us? And how realistic is it to put into practice? She looks for forgiveness in the violence of the Crusades, the turmoil of the Reformation and the quest for peace in South Africa. 　　At Ground Zero Bettany meets Cheryl McGuinness the widow of the co-pil...