Sick with Negative Emotions
How would we feel if one of our children was overpowered by a serious disease and did some terrible things without knowing what he or she was doing? We should try to view someone dear who suddenly hurts us in the same light. If we can see that person is out of control and sick with negative emotions, we will not feel so much hatred and disgust. There may be resentment, and we may not be able to love that person more than before, but almost automatically there will be a certain sympathy that will lessen or end our hatred and allow us to forgive.
-- from Daring Steps Toward Fearlessness: The Three Vehicles of Buddhism by Ringu Tulku Rinpoche, edited and translated by Rosemarie Fuchs