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 still there? Is it still out there?... Yeah. We all need mirrors to remind ourselves who we are. I'm no different.
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.
[last lines]
Leonard Shelby: Now... where was I?
Leonard Shelby: I can't remember to forget you.
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: 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 G. to look for? You're John G. So you can be my John G... Will I lie to myself to be happy? In your case Teddy... yes I will.
Leonard Shelby: If we can't make memories, we can't heal.
Leonard Shelby: We all need mirrors to remind ourselves who we are. I'm no different.
[repeated line]
Leonard Shelby: I have this condition.
Leonard Shelby: Remember Sammy Jankis.
Leonard Shelby: I don't think they'd let someone like me carry a gun.
Teddy: I fucking hope not.
[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 you take for granted.
