Walter: And I realized at that moment that despite what I’d promised, what I fully intended to do…that I could never take Peter back. The way she looked at him, I saw in her what I feared most in myself when I saw him…that I couldn’t lose him again. It was the first hole, Olivia. The first breach. The first crack in a pattern of cracks, spaces between the worlds. And it’s my fault. You can’t imagine what it’s like to lose a child.

Elizabeth: Walter? Love, you didn’t come home last night. I was worried about you. I thought…How?
Walter: He was dying, Elizabeth. This is the boy I showed you, The other Peter. It was the only way I could save him.
Elizabeth: Oh. Oh, God. Oh, my baby. Oh, my baby.
Walter: Elizabeth, don’t. He’s not ours. I have to take him back.

Walter: Is he okay?
September and Walter: [simultaneously] Who are you?…You’re the man I saw… In the lab… On the other side.
September: Your friend and the one who was injured, they left to seek medical attention. He won’t live much longer. You must fix him. Your lab is six miles from here. Can you drive?
Walter: I think so. Why… why did you save us?
September: The boy is important. He has to live.

Peter: Where are we going? Why aren’t we taking the car?
Walter: We can’t get where we’re going in a car.
Peter: You’re not my father, are you?
Walter: Of course I am. Who else would I be? I’m going to make you all better.

Alt!Elizabeth: Bring him back to me.
Walter: I promise.

Peter: Mom?
Alt!Elizabeth: Mm-hmm?
Peter: I want you to have it.
Alt!Elizabeth: What, darling?
Peter: My lucky silver dollar.
Alt!Elizabeth: Okay…
Peter: I want you to have it If I die.
Alt!Elizabeth: Sweetheart, well…
Peter: It’s okay. I’m not scared.
Alt!Elizabeth: Listen. Nothing is going to happen to you. I promise. You’re gonna be fine. You just need to get some rest now, okay?
Peter: Okay.
Alt!Elizabeth: Alright. Okay, my love.

That’s not cancer.

Nina: I know why you’re doing this. I understand. You know how much Peter meant to me, and how difficult it will be for me to admit that he’s gone. But… this. This isn’t the answer.
Walter: No. I won’t let him die again.

Carla: Walter, I’m sorry, but you can’t.
Walter: Yes. Yes, I think I can.
Carla: No, Walter, I mean you can’t. Shattering the wall between universes would rupture the fundamental constants of nature.
Walter: It’s a theory. We don’t know that to be true.
Carla: It’s a good theory.
Walter: It is why we have been lying to the military, telling them it’s impossible.
Carla: Walter, there has to be a line somewhere. There has to be a line we can’t cross.
Walter: I always considered you as a scientist, Doctor Warren…Despite your personal needs for religious claptrap. I see I was wrong.
Carla: “I am become death, Destroyer of worlds.”
Walter: Don’t you quote Oppenheimer to me!
Carla: Knowledge cannot be pursued without morality.
Walter: You sound like a pious sanctimonious southern preacher!
Carla: I may go to church every Sunday, Walter, but I also have three degrees in theoretical physics, and I am telling you you cannot do this. We both know the amount of energy required to create a portal will forever ruin both universes. For the sake of one life, you will destroy the world. Some things are not ours to tamper with. Some things are God’s.
Walter: My son is dying, Dr. Warren. I will not allow that to happen again. There’s only room for one god in this lab, and it’s not yours.

December: Their theories are fascinating.
August: They are not theories. They are entertainment.
September: I have made…a mistake.
December: So I’ve heard. What were you doing in the lab?
September: Dr. Bishop was on the verge of developing a cure for the boy. It was an important moment. He discovered me. There was no other way to witness the moment.
August: You have changed the future. You have created a new set of probabilities.
September: But you must agree the moment was significant.
August: The boy is significant.
December: You need to take action to restore balance.
September: How?
August: You will have an opportunity to fix this.

Zeppelin, Eric Stoltz, Slushos, double-decker car (cap #5), Observers, the boy is significant! Asdfghjkl;!

Walter: The compounds you’re using for the cure…not random at all. You are very…very smart. Yes! You did it! By God, you did it! No. No, no, y—you had it, the cure! All you have to do is stabilize the compound, and you can save him! You can save him!

Elizabeth: Walter, what is this? How’s this possible? How are you doing this?
Walter: What I’ve been working on, Elizabeth, it’s a window to another universe. Like ours, but different.
Elizabeth: Please. Please turn it back on again. Please turn it on. I want to see him again!
Walter: Elizabeth, I am telling you this because I want you to know that somewhere Peter will grow up, somewhere he will lead a proper life, somewhere he will be happy, but just not here. And we must take comfort in this. And we must begin to move on.

Elizabeth: We didn’t give him a good life. We didn’t. He practically never got out of the house.
Walter: He was always too sick.
Elizabeth: He didn’t go to a proper school. He didn’t have any proper friends. He…he had no family but us. We kept him so well, we never let anyone else get to know him.
Walter: We did the best we could. We dealt with what we were given. He knew he was loved. Didn’t he?