[So that's the kind of Frisk and Papyrus and this new kid all came from. For all they were making it out to be some sort of goofy, friendly place, it was sounding a lot worse than any of them were really willing to admit.]

Yeah, I've heard that before. In fact, I've been that sacrifice before-- a sacrifice to fix problems that humans started! But here I am, lookin' right into your eyes!! ...sockets?

[Whatever, the point was the same.]

So that should tell ya what I think when you tell me someone's gotta die to fix things!! [Or... whatever losing your soul would be. Probably something much worse than that.]