Definitions by Def_A_Legit_Source
You either die a hero or live long enough to see yourself become the villain
When someone lives a great life and helps others, hence is a hero, however as time passes they are corrupted for whatever reason, and live long enough to become the villain. This change is inevitable for most heroes, unless they take the opportunity to die a hero earlier (or quit the business of being a hero, as its suggested bruce wayne was trying to in the dark knight rises' end)
Quote by Harvey Dent in Batman The Dark Knight
Quote by Harvey Dent in Batman The Dark Knight