Above all, don't lie to yourself. The man who lies to himself and listens to his own lie comes to a point that he cannot distinguish the truth within him, or around him, and so loses all respect for himself and for others. And having no respect he ceases to love.
—Dostoyevsky
Teddy: You don't want the truth. You make up your own truth! Like your police file. It was complete when I gave it to you. Who took out the 12 pages?
Leonard: You, probably
Teddy: No, it wasnt' me. See, it was you!
Leonard: Why would I do that?
Teddy: To create a puzzle you could never solve!
Teddy: Lenny, you can't trust a man's life to your little notes and pictures
Leonard: Why not?
Teddy: Because your notes could be unreliable
Leonard: Memory's unreliable
Teddy: Oh, please!
Leonard: No, no, really! Memory's not perfect. It's not even that good. Ask the police. Eyewitness testimony is unreliable. The cops don't catch a killer by sitting around remembering stuff. They collect facts, they make notes and they draw conclusions. Facts, not memory. That's how you investigate. I know. It's what I used to do. Look, memory can change the shape of a room. It can change the colour of a car and memories can be distorted. They're just an interpretation. They're not a record. They're irrelevant if you have the facts.
Teddy: So you lie to yourself to be happy - there's nothing wrong with that, we all do it.
Leonard: I take it I've told you about my condition.
Teddy: Only every time I see ya.
Leonard: I don't think they'd let someone like me carry a gun.
Teddy: I ******* hope not.
Natalie: What's the last thing that you do remember?
Leonard: My wife..........
Leonard: My wife...
Natalie: That's sweet.
Leonard: ..............dying.