"You either die a hero or live long enough to see yourself become the villain."

This dialogue was spoken by Harvey Dent in the 2008 movie i.e. "The Dark Knight".He spoke the harsh reality of life in this dialogue.A person is considered as a hero if he does something good for someone.If the person does something bad to you then you consider him as a villain.There are times when you are a hero for someone but gradually you become a villain for them due to some reasons.You either die as a hero for someone because you have not known that person truly or that person is also doing good to you.If you keep doing good to that person till the end,then you die a hero for them.If this does not happens,you come to know their reality and what they really are,you start doing bad to them or stop doing the good things you used to do for them.In this case,you become a villain for them.Hence,you either die a hero for them or live long enough to see yourself become the villain for someone.