Introduction: Three Simple Truths About Revenge and Forgiveness.
1 Putting Vengeance and Forgiveness Back into Human Nature.
2 Revenge Is a Problem: Counting the Costs.
3 Revenge Is a Solution: Three Evolutionary Hypotheses.
4 The Retribution Solution: The Evidence for Adaptation.
5 Family, Friendship, and the Functions of Forgiveness.
6 The Forgiveness Instinct.
7 The Forgiving Brain.
8 "To Promote and to Maintain Friendly Relations": Making Forgiveness Happen.
9 From Neurons to Nations.
10 Divine Forgiveness and Righteous Revenge.
11 Homo ignoscens.