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
Darren the legend went to get some us some underage beer with their fake id, but got busted and ended up snitching on us to the feds.

I guess it's true, you either die a hero or live long enough to see yourself become the villain, jeoffrey said in his prison cell of 25 years.