Walter: It's not important now. I need you to take me to the bridge.
Lincoln: What?
I need to see Nina Sharp. I know what's happening to Olivia.

If Sean and his half brothers are linked in a telepathic network, then it's possible they have formed a collective identity.

Walter

Lincoln: So, in the department of strange, what are we thinking? That one of these children killed Greene because of the story he was writing?
Olivia: Maybe.

How can she have memories of my Olivia's life that are clearer to her than her own?

Peter

I remember it. I remember us. I remember everything.

Olivia

This might be a little bit weird, but I was wondering if I could come in and just have a look around?

Olivia

Lincoln: There really aren't any normal days on this job, are there?
Olivia: Nope.

Peter: Just be straight with me. Are you okay?
Olivia: Yeah, I'm fine.
Peter: Then why did you kiss me?
Olivia: I don't know. It just felt like that's what we do. It just felt normal.

Peter: Wow. What is that that smells so fantastic?
Olivia: What do you mean? It's Friday. I ordered Damianos!

Ah yes! We can resume our efforts to get you home.

Walter

Olivia: What's she like? The other Olivia? I'm just curious.
Peter: She's a, she's driven. She's very, very stubborn. She doesn't like to lose. She sees the best in people, even when they don't see it themselves. When she first found me, I was in Baghdad trying to run a scam on these two Iranian businessmen...
Olivia: I didn't see you as the scamming type.
Peter: That's what made me so good at it. Anyway, it was all supposed to be temporary. She told me I just had to babysit Walter while he was working on a case for the FBI and then I could leave and go back to my own life. Despite, of course, how gorgeous she is.
Olivia: You've got good taste.

Oh Peter, I don't know how to explain it but it feels like there was somebody else in my head.

Olivia

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.