"Through incarnations, some beings do go down. That is to say, they forget. The soul falls into an eclipse of itself and there is a downward progression for a time."

Next Quote

But if you ever bring her back damaged again - and I don't care whose fault it is; I don't care if she merely trips, or if a meteor falls out of the sky and hits her in the head - if you return her to me in less than the perfect condition that I left her in, you will be running with three legs. Do you understand that, mongrel?

— Stephenie Meyer