Xander: Why blood? Why Dawn’s blood? I mean, why couldn’t it be, like, a lymph ritual?
Spike: Because it’s always got to be blood.
Xander: We’re not actually discussing dinner right now.
Spike: Blood is life, lackbrain. Why do you think we eat it? It’s what keeps you going, makes you warm, makes you hard, makes you other than dead. Of course it’s her blood.
(Source: thebuffster)