Works with their own Quotes pages:
The Franchise in general:
The first film:
Ripley: How do we kill it Ash? There's gotta be a way of killing it. How? How do we do it?
Ash: You can't.
Parker: That's bullshit.
Ash: You still don't understand what you're dealing with, do you? A perfect organism. Its structural perfection is matched only by its hostility.
Lambert: You admire it.
Ash: I admire its purity. A survivor... unclouded by conscience, remorse, or delusions of morality.