This concept is never more obvious than when someone feels they have been wronged by another. The fact of the matter is, no one can hurt you. They can hurt your body, but that's about the worst they can do. If words are hurting you, if action is hurting you, if inaction is hurting you, I believe it's very important to focus on the why. The interesting thing about the question "why." "Why" is the water of the cerebral world. We can answer it anyway we want yet each time we answer it, it begins a new. "Why" conforms to our thought patters, while eating away at some of our most sacred of thoughts.
"Why" is also a powerful calming device. When you feel wronged, try asking yourself why you are feeling the way you do. When you find that out, ask yourself why whatever "caused" you to feel that way is doing so, and so on. You'll find that "why" can destroy almost any negative emotion if you let it.
If this process sounds familiar to you, it's probably because you've spent time with a 5 year old. This is one of my many reasons for believeing we become less and less enlightened as we age, at least in the first half of our lives. This would make sense as birth and death are the closest we are to the non-corporial world, so enlightenment likely looks more like a curve than a single slope. All this has much more detail to it, but I work better in discussion than "lecture."