Alan Rickman aka Professor Snape from the Harry Potter movies! Professor Snape is my favorite character in the series and Alan Rickman was the perfect actor to play him! I absolutely positively love this quote from him!
This is a quote from American History X. I used this as inspirition as it it's film where a brother helped to change his younger borther's life who was going down the same path as him. Change can always happen regardless of the mistakes made.