Leonard Shelby: We all lie to ourselves to be happy.
Leonard Shelby: [running] OK, so what am I doing? [sees Dodd also running] Leonard Shelby: Oh, I'm chasing this guy. [Dodd shoots at Leonard] Leonard Shelby: No... he's chasing me.
Leonard Shelby: I have to believe in a world outside my own mind. I have to believe that my actions still have meaning, even if I can't remember them. I have to believe that when my eyes are closed, the world's still there. Do I believe the world's s...
[last lines] Leonard Shelby: Now... where was I?
Leonard Shelby: Memory can change the shape of a room; it can change the color of a car. And memories can be distorted. They're just an interpretation, they're not a record, and they're irrelevant if you have the facts.
Leonard Shelby: I'm not a killer. I'm just someone who wanted to make things right. Can't I just let myself forget what you've told me? Can't I just let myself forget what you've made me do. You think I just want another puzzle to solve? Another John...
Teddy: You don't want the truth. You make up your own truth.
Natalie: What's the last thing that you do remember? Leonard Shelby: My wife... Natalie: That's sweet. Leonard Shelby: ...dying.
Leonard Shelby: If we can't make memories, we can't heal.
Leonard Shelby: I can't remember to forget you.
Leonard Shelby: I don't even know how long she's been gone. It's like I've woken up in bed and she's not here... because she's gone to the bathroom or something. But somehow, I know she's never gonna come back to bed. If I could just... reach over an...
Leonard Shelby: We all need mirrors to remind ourselves who we are. I'm no different.
Leonard Shelby: Remember Sammy Jankis.
[repeated line] Leonard Shelby: I have this condition.
[finding a beaten man in his closet] Leonard Shelby: ...who did this to you? Dodd: What? Leonard Shelby: Who did this to you? Dodd: You did.
Leonard Shelby: There are things you know for sure. Natalie: Such as? Leonard Shelby: I know what that's going to sound like when I knock on it. I know that's what going to feel like when I pick it up. See? Certainties. It's the kind of memory that y...
Natalie: But even if you get revenge you're not gonna remember it. You're not even going to know that it happened. Leonard Shelby: My wife deserves vengance. Doesn't make a difference whether I know about it. Just becuase there are things I don't rem...
Natalie: Tell me about her again. Leonard Shelby: Why? Natalie: Because you like to remember her. Leonard Shelby: She was beautiful. To me, she was perfect. Natalie: No, don't just recite the words. Close your eyes... and remember her. Leonard Shelby...