Karma. Many people use the word but how many truly understand the meaning of it. The basic belief is that what you put out into the universe will come back to you. I have seen this happen .I do believe that there are different levels though.
There are certain things some do in life that I feel are just huge Karmic no-nos. For example: I don't think anyone can go around in life specifically hurting others without experiencing reprocussions. It's just not right.
So the next time you experience something that is truly unjust and hurtful...like betrayal...distance yourself and know that sooner or later it all catches up ! Namaste!