Olivia: Peter, I'm in love with you. I can't just turn that off and I don't want to lose you. Where are you going?
Peter: Home. I have to go home.

Peter I don't understand what's happening to me any more than you do, but that doesn't change what I do know, and what you know, that if you look into my eyes, then you can see that I'm her.

Olivia

I am called September, but that is a code designation given members of our scientific team.

September

Because of the cortexiphan, I don't remember certain aspects of our relationship. I can't remember things about us.

Olivia

Astrid: Wait, stop.
Peter: What, what do you see?
Astrid: I don't see anything, but I really have to pee and I don't want to miss anything.
Walter: I've had the same issue for the past ten minutes!

Walter: Whatever consciousness Olivia appears to be manifesting now, she is not who she appears to be.
Peter: You don't know that!

Philip, you know me. Do you honestly believe I have been dosing Olivia with cortexiphan. That I could have had anything to do with her kidnapping?

Nina

Observer: Do we know why he failed to carry out his instructions? Why he did not erase the lingering traces of Peter Bishop in this timeline.
Observer 2: No. That is a question only September can answer. As well as if he is responsible for Peter Bishop's return.

Olivia Dunham. I've waited so very long to meet you.

David Robert Jones

I don't know you that well, but I'd like to think you weren't ignoring her safety for personal reasons. And that you aren't ignoring me right now!

Lincoln

Peter: I'm thinking about it. It's all I've been thinking about. And I'm afraid. I'm afraid because I've made this mistake before. I betrayed the Olivia that I love. But what I'm really afraid of is that when I look in your eyes is I know it's you. I know it's you.
Olivia: I just gotta, um...I just gotta go pee.

Olivia: I'm confused too. I feel incredibly close to you. I feel like I know you better than anyone else in the world and then when you look at me it's like none of that is true.
Peter: Olivia, I don't know what you want from me.

Fringe Season 4 Quotes

You know they did a study on sarcastic people, and they get more illnesses than other people. Something to do with negative energy.

Robert Danzig

Fauxlivia: You know, being you and living your life, only me more homesick for my universe.It must be hard to develop trust in people when all you've got is yourself. It must be terribly lonely.
Olivia: Just because you have walked in my shoes, don't you think for a moment that you know me.
Fauxlivia: Yeah, keep telling yourself that.