- Barbara Wright: Oh, don't you see? If I could start the destruction of everything that's evil here... then everything that is good would survive when Cortez lands.
- The Doctor: But you can't rewrite history! Not one line!
- Susan Foreman: Barbara, the high priest is coming.
- The Doctor: Barbara, one last appeal: what you are trying to do is utterly impossible! I know, believe me, I know!
- Barbara Wright: Not Barbara, Yetaxa.
- [first lines]
- Barbara Wright: Look at that!
- Susan Foreman: I am.
- Barbara Wright: It's an Aztec mask. He must have been a priest.
- Susan Foreman: Oh, the Aztecs were Mexicans. We must be on Earth again. I wonder what year it is?
- Barbara Wright: He must have died around 1430 I should think.
- Susan Foreman: How do you know that?
- Barbara Wright: All these things belong to the Aztecs' early period.
- Susan Foreman: Now that's what I call really knowing your subject!
- Barbara Wright: Ah well, that was one of my specialties, Susan.
- The Doctor: You know who he is?
- Ian Chesterton: The local butcher by the look of him.
- The Doctor: Exactly!
- Susan Foreman: Well, they've treated us alright, so far.
- The Doctor: The Aztec's always showed the utmost courtesy towards their intended victims.
- The Doctor: [to Ian] If human sacrifice is their tradition, let them get on with it. But for our sakes, don't interfere!
- Tlotoxl: [after the sacrificial victim jumps to his death] With death came rain!
- Barbara Wright: Without your sacrifice came rain.
- Barbara Wright: But don't you see-if I could start the destruction of everything that's evil here, then everything that's good will survive when Cortez land!
- The Doctor: But you can't rewrite history-not one line!