Not in order.
"No one is immortal." - Kakuzu
"Self-sacrifice… A nameless shinobi who protects peace within its shadow… That is a true shinobi." - Itachi
"Those who can't acknowledge their real selves are bound to fail." - Itachi
"Destroy everything… Erase everything that hurts you… Entrust your heart to me… I will save you from your suffering…" - Nine Tails
"Being skilled isn't all that's it's made out to be. When you're strong, you become arrogant and withdrawn. Even if what you sought after was your dream." - Itachi Favorite
"A monster, eh..? As you said, I had a messed up childhood. I was born into this world by taking the life of a woman I would have called my mother... to become the ultimate shinobi... with my father attaching the incarnation of the sand upon me through ninjutsu... I was born a monster. Called Shukaku, it was sealed within a kettle. It's the living spirit of an old Hidden Sand priest. Love? ... Don't judge me with your measuring stick... you wanna know what kind of connection that is to me? It's simply pieces of meat... connected to me with murderous intent and hatred. By sacrificing my mother's life... I was created as the village's greatest masterpiece as the kazekage's son. My father taught me the shinobi secrets, I was spoiled and allowed to do as I pleased... I though that was love... until that incident occurred. For the last 6 years from when I was 6 old years old... ... my own father has tried countless times to assassinate me!! A being too strong can become and existence of fear. Born through jutsu, my spirt was unstable... it seems the idiots in the village finally realized there was a problem. To my father, kazekage, I was the village's trump card, but... at that same time I was also a very danerous being... It seems that by the time I was 6, it was determined that I was too dangerous. As the village's dangerous tool... I was only being used with care. To them I am simply an object from the past that they wish would disappear. Then why do I exist? Why am I alive? When I though about this I could find no anwser. But as youy live you need a reason, otherwise it's the same as being dead. I then came to this conclusion, "I exist to kill every human besides myself." I finally found relief within the fear of death, of never knowing when someone would assassinate me.. by continually killing the assassins... I understood the reason to continue living. Fighting for only yourself, living while loving only yourself. If you think that everyone else simply exists to allow you to experience that feeling, nothing is better that that world. As long as there are people in this world for me to kill and continue to feel that joy of living... My existence will not vanish." - Garra