Hidan: Hey, look at that, it's my headband! You went to the trouble of picking it up and keeping for me? I'm touched. You're a pretty nice guy, Kakuzu, you knwo that? Kakuzu: Shut up. Let's go. Hidan: Let me put it on at least! Okay, I'm coming. Admit it, you like me a little, doncha? Kakuzu: Either you shut up, or I'll kill you. Hidan: Haha, you're embarrassed! I understand.

I never go back on my word! That's my nindo, my ninja way!

Sasori, your strength came because of your soul, not in spite of it... You were supposed to be a a top-class ninja puppeteer, not a worthless nobody who lets someone else pull the strings. - Kankurou (Naruto Ch 518)

Darkness... When everything that you know and love is taken from you so harshly, all you can think about is anger, hatred, and even revenge. And no one can save you.

Hidan: That was pitiful! What happened there, buddy? Kakuzu: You should talk. I wasn't the one who fell for a shadow clone! Hidan: Ahaha, right. You saw that?

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?

Then when I saw Pain attack Hinata, I was so mad, so full of rage, I let the Nine-Tails take over without even thinking about it.