"Never!", say some. "I can't", say others. "How can I?" says another group. "What was done to me was just too terrible to be forgiven", say most.
Let's examine that last statement. Without a doubt whatever it was that was done to you was bad. We can't change that. Child abuse, child neglect, abandonment, betrayal, domestic violence, false promises - the list goes on and on, and all of us