Anger is a deluded mind that focuses on an animate or inanimate object, feels it to be unattractive, exaggerates its bad qualities, and wishes to harm it. For example, when we are angry with our partner, at that moment he or she appears to us as unattractive or unpleasant. We then exaggerate his bad qualities by focusing only on those aspects that irritate us and ignoring all his good qualities and kindness, until we have built up a mental image of an intrinsically faulty person. We then wish to harm him in some way, probably by criticizing or disparaging him.It is that last observation that is truly revolutionary when you think about it. What if we were able to realize - on a consistent basis - that the "person" with whom we're angry does not actually exist? WOW!
Because it is based on an exaggeration, anger is an unrealistic mind; the intrinsically faulty person or thing that it focuses on does not in fact exist.
I found the piece right here. It's by Geshe Kelsang Gyatso.