Itachi's. “In order to survive, we cling to all we know and understand. And label it reality. But knowledge and understanding are ambiguous. That reality could be an illusion. All humans live with the wrong assumptions. Isn't that another way of looking at it?"
"You aren't even worth killing, foolish little brother."
"If you want to kill me, despise me, hate me, and live in an unsightly way... Run, and cling to life. . ."
"People live their lives bound by what they accept as correct and true. That's how they define "Reality." But what does it mean to be "correct" or "true"? Merely vague concepts... their "reality" may all be a mirage. Can we consider them to simply be living in their own world, shaped by their beliefs?"
"We are unique siblings. I am the barrier you must overcome, so you and I will continue to exist together, even if you hate me. That's what being a big brother means."
Nagatos philosophy on peace is probably the most valid one though. Two of them are my favorite characters, amazing philosophies!!!
*fangasm*