Comprenderlo todo es perdonarlo todo

On the other hand, what's the point of a good movie about memory if you don't leave a few things up for grabs? As Leonard himself tells Teddy fairly early on, "Memory's unreliable ... Memory's not perfect. It's not even that good. Ask the police; eyewitness testimony is unreliable ... Memory can change the shape of a room or the color of a car. It's an interpretation, not a record. Memories can be changed or distorted, and they're irrelevant if you have the facts." This is the very heart of the film. "Memento" is a movie largely about memory -- the ways in which it defines identity, how it's necessary to determine moral behavior and yet how terribly unreliable it is, despite its crucial role in our experience of the world.


http://archive.salon.com/ent/movies/feature/2001/06/28/memento_analysis/print.html