Nearly everyone has wronged another. Who among us has not longed to be forgiven? Nearly everyone has suffered the bitter injustice of wrongdoing. Who has not struggled to forgive? Charles Griswold has written the first comprehensive philosophical book on forgiveness in both its interpersonal and political contexts, as well as its relation to reconciliation. Having examined the place of forgiveness in ancient philosophy and in modern thought, he discusses what forgiveness is, what conditions the parties to it must meet, its relation to revenge and hatred, when it is permissible and whether it is obligatory, and why it is a virtue.