How we cite our quotes: (Part.Paragraph)
Quote #1
"As if [immortality] were our very birthright, which we could not come to grasp the meaning of until this time of middle life when we looked on only as many years ahead as already lay behind us." (1.169)
Immortality gives Louis a unique perspective on mortality. Many people believe themselves to be immortal until a certain age, when that all changes. For Louis, he not only gets to preserve his youthful appearance, he also gets to preserve the reckless abandon that comes with youthful ignorance.
Quote #2
"This was slow decay, the body refusing to surrender to the vampire of time which had sucked upon it for years on end." (1.223)
Louis has a dislike for mortal life. Not that he dislikes mortals, but he seems to dislike the unfair nature of the life cycle, especially now that he has some control over it.
Quote #3
"It was only when I became a vampire that I respected for the first time all of life." (1.351)
You've seen the cheesy movies where the rich person switches places with the poor person from the other side of the tracks. This is like that. Louis only appreciates what he had—real life—once he becomes immortal.