How are forgiveness, mercy, and love related?
All three are moral virtues. Agape is the over-arching virtue out of which forgiveness emerges. Mercy does not necessarily emerge out of agape because mercy does not always require serving others through one’s own pain, as occurs in agape. The judge who shows mercy to a defendant by reducing a deserved sentence is not necessarily suffering in love for that defendant. Thus, not all aspects of mercy flow from agape. Forgiveness includes a number of virtues such as patience, kindness, and having mercy on others who behave badly. So, forgiveness is a specific part of agape. Forgiveness includes mercy, but mercy is not an over-arching virtue out of which forgiveness emerges. That distinction belongs to agape.