C：Well, it's not very scientific, Murph.
M：You said science was about admitting what we don't know.
C：I need to fix this before I go.
M：Then I'II keep it broken so you have to stay.
C：After you kids came along, your mom said something to me I never quite understood. She said, “Now, we're just here to be memories for our kids.” And I think that now I understand what she meant. Once you're a parent, you're the ghost of your children's future.
M：You said ghosts didn't exist.
C：That's right, Murph. Murph, look at me. I can't be your ghost right now. I need to exist. They chose me.
B：You know, out there we face great odds. Death, but not evil.
C：You don't think nature can be evil?
B：No. Formidable. Frightening. But no, not evil. Is a lion evil because it rips a gazelle to shreds?
C：Just what we take with us, then.
B：Couldn't you have told her you were going to save the world?
C：No, when you become a parent, one thing becomes really clear. And that is that you want to make sure your children feel safe. And it rules out telling a 10-year-old that the world is ending.
M：I never made one of these when you were still responding because I was so mad at you for leaving. And then when you went quiet, it seemed like I should live with that decision. And I have. But today's my birthday. And it's a special one, because you told me... You once told me that when you came back, we might be the same age. And today I'm the age you were when you left. So it would be a real good time for you to come back.
B：When I say that love isn't something we invented. It's observable, powerful. It has to mean something. We love people who have died. Where's the social utility in that? Maybe it means something more, something we can't yet understand. May it's some evidence, some artifact of a higher dimension that we can't consciously perceive. I'm drawn across the universe to someone I haven't seen in a decade who I know is probably dead. Love is the one thing we're capable of perceiving that transcends dimensions of time and space. Maybe we should trust that, even if we can't understand it yet.