RUBY: That's what I don't understand. She… she's so ordinary.

DOCTOR: She's wonderful.

RUBY: No, she's wonderful and she's ordinary, but I love her for that. I just… How did she stay invisible from a god? She defeated Sutekh.

DOCTOR: She was important… because we think she's important. That's how everything happens, every war, every religion, every love story. We invest things with significance. So while the whole of creation was turning around her, it made her sheer existence more powerful than Time Lords and gods. In the end, the most important person in the universe… was the most ordinary. A scared little girl… making her baby safe.