"It is true that those who break the rules are scum, but those who abandon their friends are worse than scum." - Kakashi Hatake
"Even if the path comes with pain, I will walk with my comrades all the same." - Kakashi Hatake
"As long as I have those who love me, I will never give up." - Minato Namikaze, the 4th Hokage
"The Will of Fire illuminates the village, and it will continue to burn even brighter." - Hiruzen Sarutobi, the 3rd Hokage
"Long ago, "friend" was just a word to me, but I came to realize what's important is the meaning behind that word" - Gaara
"Give up trying to make me give up!" - Naruto Uzumaki
"There's no hope for peace, not as long as we live in this cursed world!" - Nagato Uzumaki
"In that case, I'll break the curse! If there's such a thing as peace, I'll find it!" - Naruto Uzumaki
"You do not know what kind of person you truly are until the very end. Don't you think that's what death is about?" - Itachi Uchiha
"One's reality might be another one's illusion. We all live inside our own fantasies." - Itachi Uchiha
"Never bet your own life until you have somebody you can entrust it to, someone that will inherit your will." - Asuma Sarutobi
This is it for now, I might edit to add more later