"In this world, wherever there is light - there are also shadows. As long as the concept of winners exists, there must also be losers. The selfish desire of wanting to maintain peace causes wars, and hatred is born to protect love."
Madara Uchiha
"Every human being relies on and is bounded by his knowledge and experience to live. This is what we call “reality”. However, knowledge and experience are ambiguous, thus reality can become illusion. Is it not possible to think that, all human beings are living in their assumptions?"
Itachi Uchiha
"I'll admit that you're stronger than before. But because of that, you seem to have lost sight of what's truly important. Now listen carefully. The people of the village, who once abhorred you, have begun to admire you. They think of you as a comrade. It's because you fought hard for their acceptance. You once said it was everyone who cares about you who helped you get where you are now. If you forget others because you have power, and become arrogant and egotistical, you'll eventually become just like Madara. No matter how powerful you become, do not try to shoulder everything alone. Becoming the Hokage doesn't mean people will acknowledge you. But when the people acknowledge you, you can become Hokage. Never forget your friends!"
Itachi Uchiha