“All this time…ever since I sold my soul, I’ve been clinging to this idea that there is something pure and decent out there. That there was something to give me hope that even if I was a lost cause, at least there was something bright and good in the world. But there isn’t. If there was, Seth wouldn’t have fallen. Erik wouldn’t have died. Andrea Mortensen wouldn’t be dying.” -Georgina to Carter”

“I do think there’s always a way to put things right. If I didn’t believe that I wouldn’t get out of bed in the morning, I wouldn’t eat breakfast; I wouldn’t leave the TARDIS ever. I would never have left home. There is always something we can do.”

“I’m an only child, so logically I gave birth to my parents, because if it weren’t for me they wouldn’t be parents at all, they’d simply be a married couple. (Or maybe without me they wouldn’t even have been married!)
”

“If I died tomorrow, he wouldn’t cheer, he wouldn’t break down. He wouldn’t do anything.”

“If I had I could have helped him. He’d still be here, and I wouldn’t have this heartache. My joy wouldn’t be dissolving slowly, casting out all the light and bringing in darkness. I wouldn’t be growing weak, letting everything gnaw at me until I can’t take it anymore. I’d still be me. -The Last Night”

“I don't care," said Seth. "I would have done it. I would have sold my soul for you. You and me...I told you. Something's always going to keep us near each other...even if we aren't together.”