These four steps represent the path Humanity has taken. From grass to ice. From ice to steel. And from steel to the light of the Eternal Engine.

Wilford

Asha: You pushed past what was safe, even sane, to rescue me. Why?
Layton: I'm just glad I did.

Wilford: If you'd only stayed loyal.
Ruth: I am loyal. To something bigger than you. You've got it all wrong, Mr. Wilford.
Wilford: I hear that all the time. And then I win.
Ruth: Winning isn't leading. And loyalty isn't enough on its own. It has to come with love. And not the kind that you feed off. Unconditional love. Sacrifice. For each and every passenger. You can't ignore love. You can't predict it either.

Wilford: They're preparing the port for you now. I'll make sure they mount the cuff nice and high, where prosthetics are impossible.
Ruth: Wouldn't wear one anyway.

Wilford: The irony is I built the ports in as an idle threat. Never expected to use them. You did. Thirteen times.
Ruth: I'll pay my penance. You can have my arm.

Snowpiercer Season 3 Episode 2 Quotes

Next, the cold comes for your mind. And after that, your will. And yet, still, the heart fights on.

Ruth

When the cold comes for you, the blood stops running to your limbs. It pools up inside to keep your organs warm.

Ruth