None of know for sure what's out there. That's why we keep looking. Keep your faith. Travel hopefully. The universe will surprise you. Constantly.

The Doctor

Ryan: Hey! You shot him!
Graham: Yeah, but just the foot. Just in the foot. Just to shut him up. Don't tell The Doc. She'll be livid.

Tim Shaw: You are no warrior.
Graham: No. I'm the better man.

Andinio: I don't have to answer all these questions.
The Doctor: That's what my teachers used to say. Usually, just as they quit teaching.

Ryan: You think that's what Nan would want?
Graham: No, I think your Nan would want to be alive. She actually liked being alive and she was really good at it. And she'd say to me,'Graham, if you get the chance, you send that little piece of rubbish to kingdom come,' Because, you know why? Your Nan might've been kind, but she was also tougher than you and me put together.

Whatever happened to doors? Don't aliens bother with doors?

Ryan

The Doctor: Grenades. As insurance policy.
Paltraki: You think that's smart?
The Doctor: I think it's a precaution. I like precautions. Always take precautions. Especially when you don't know what you're doing.

Ryan: What happened to 'never do weapons'?
The Doctor: It's a flexible creed. Door, locks, walls, buildings. Fair game. If it can be rebuilt, I'll allow it.

Graham: He's the commander.
Ryan: Maybe he killed his own crew.
Graham: Always one for the cheery option.

Graham: And it has to be us does it? Answering these signals from this planet?
The Doctor: No, not at all. But everyone else has passed them by. Y'think we should do the same?

Andinio: It's time. You ready, Delph?
Delph: I don't think I am.
Andinio: Seventeen years is enough. This is what I've trained you for.
Delph: You call it training. I call it building doubt. Every lesson that you've given me, I feel like I've understood less, not more.
Andinio: Which is the point. The more we learn, the less we realize we know. This is our faith. This is our existence. The Creator would contend the world is not to be understood, only experienced.

Doctor Who Season 11 Episode 10 Quotes

Graham: And it has to be us does it? Answering these signals from this planet?
The Doctor: No, not at all. But everyone else has passed them by. Y'think we should do the same?

Andinio: It's time. You ready, Delph?
Delph: I don't think I am.
Andinio: Seventeen years is enough. This is what I've trained you for.
Delph: You call it training. I call it building doubt. Every lesson that you've given me, I feel like I've understood less, not more.
Andinio: Which is the point. The more we learn, the less we realize we know. This is our faith. This is our existence. The Creator would contend the world is not to be understood, only experienced.