Death

 I think that the quote "Then you should never have been born.", is an important quote in the book Thirst NO.1 (on page 112) because that is Alisa's (Sita's current name in the book) favorite line to say before she kills a person and they whine while she is about to kill them. This may sound cruel and all, but then Alisa only says that because all people get born and then die after a while, so then it's true. I think that this is an important quote in the book Thirst NO.1 because this quote shows Alisa's sincerity in the story and it also shows her "evil" side in a way (what the people in the story think when she is about to kill them).