Here is two by who is possibly the most under appreciated character in Naruto, in my opinion:
When a person dies, he disappears, along with his past, current lifestyle, and his future. Many people die in missions and wars. They die easily and in surprisingly simple ways. Hayate was one of them. Those who died had hopes and dreams, but everyone has something as important as those: parents, siblings, friends, lovers; people who are important to you, they trust and help each other. The bond between the people important to you ever since birth and the string that binds them becomes thicker and stronger as time goes by... It's beyond reason. Those bound to you by that string will do that because it is important.
It seems like the small leaves in the Village of Konoha have inherited that "will of fire" you spoke of, Third. The fire on the leaves will eventually burn greater and stronger.... It will flash its light and protect this village.
"Naruto... it's too late, nothing you can say will change me! I'm going to kill you and every last person in your beloved village! It's time to make your choice! Kill me and become a hero, or die at my hand and become another one of my victims!"
I'm Kakashi Hatake. Things I like and things I hate...I don't feel like telling you that. My dreams for the future...never really thought about it. As for my hobbies...I have lots of hobbies."_kakashi
(To Sasuke, Naruto, and Sakura) "In the ninja world, those who break the rules are scum, that's true, but those who abandon their friends are worse than scum."_kakashi
"I won't allow my comrades to die. I'll protect you with my life. Trust me."_kakashi
"Sorry I'm late, I'm afraid I got lost on the path of life."_kakashi
"I'm not a pervert! ...I'm a super-pervert!"-Jiraiya
"Wow, Sarutobi-sensei... you're a perv."-Jiraiya
my personal favorite:
"I like them ripe and luscious with curves like that, see? And big, but not too big, know what I mean? If you bring me something like that, I will train you 'till the cows come home!"-Jiraiya
"You two don't know me at all, do you? Should've done your homework. Jiraiya the Toad Sage falls victim to no woman's charm! Rare beauties drop for me like blossoms in a storm! It isn't in my nature to be duped by the wiles of women. When you've reached the stature I have, the ladies kneel and worship at your awesomeness!!"-Jiraiya
"I guess its time to put down my pen. Oops right, I need a title for the next book, lets see Ah got it. "The Tale of Uzumaki Naruto"...Perfect."-Jiraiya
"It's alright... I'm the son of the Fourth Hokage... so I can handle it."
"I'll need the Nine-Tails' chakra to fight Sasuke. I can't escape the fact that I'm the Nine-Tails' jinchūriki. It's time for me to stop running."
"I noticed your beautiful hair right away."
"The seal is set so that if eight tails are released, I'll appear within your subconscious. I didn't want that to happen... since I never wanted to see you again, Nine-Tails... but... I looked forward to seeing how my son had grown... so I guess you could call it even."
"You will find the answer... I believe in you."
"Forgive me Sasuke... ...It ends with this."
"My name is Sasuke Uchiha. I hate a lot of things, and I don't particularly like anything. What I have is not a dream, because I will make it a reality. I'm going to restore my clan, and kill a certain someone."
"From now on we are not Team Hebi, we are Team Taka, and our goal will be to destroy Konoha."
"I have long since closed my eyes... My only goal is in the darkness."
"It's perfect... I can feel Itachi's power... I can feel myself getting stronger...!"
"The true power of the Sharingan... this Madara Uchiha's power!"
" When a man learns to love, He must bear the risk of hatred."
"The Uchiha is a clan destined for revenge..."
"In that case, I hereby declare... the Fourth Ninja World War."
Black side: "Idiot, it's not that simple." White side: "It'll be all right. Tobi is a good boy."
"A rock thrown at a pole will not hit, but if one does not aim at the pole, it will hit! That is the law I used!" ~ Rock Lee
"A genius, huh? What does that mean? 'Genius'? So I was not born with a whole lot of natural talent, not gifted like Neji ... but I work hard and I never give up! That is my gift; that is my ninja way!" ~ Rock Lee