Trying to unlock the mysteries of nature, you toy with people's lives for the sake of this vain and ridiculous cause of yours. [reflects on Itachi massacring his clan to measure his power] You disgust me. [Orochimaru reveals his true form, a giant snake] The giant white scaled snake. Never would've recognized you. So that's your true form. In order to keep switching from body to body, you experimented endlessly and this is what you've become.
A snake that crawled on the earth dreamt of soaring through the sky, knowing full well it was impossible. Still hoping beyond hope, it kept its eye on a baby bird that it nurtured in its own nest, little realizing that... [activates his curse mark's second level and grows wings] That snake is now the prey because that bird is a hawk... ready to take to the sky!
[as he speaks, Sasuke just stares with his Sharingan] You're about to be killed by my art. That is what annoys me the most about you and your brother! You think you're just so cool! Those eyes, those overconfident eyes make me sick! Your eyes, always judging me for my art! I'll never forgive them for that! You have absolutely no respect for my art! I can tell that you don't! I can never forgive those eyes that just ignore my art!
Sasuke
I couldn't care less about all that. I just want you to tell me where I can find Itachi. [Sasuke's Sharingan fades and he still stares]
So you've retracted your Sharingan. Do you really take me that lightly? [Deidara rips his shirt off revealing a mouth on his chest that he feeds explosive clay] This is my ultimate art. This time I'm going to detonate myself!
[last words] In death I shall become art itself! No one's seen an explosion like this, one that will leave behind a scar on the very earth itself. And then I'll receive more admiration for my art than anyone has ever seen before! Sorry, Tobi. But while I will be admired you will most definitely be dead! This explosion will cover 10 kilometers! You can't run away from this one, hmm! Tremble, be afraid, recoil in despair, cower in awe, and cry your heart out! Because my art... IS AN EXPLOSION!
[Remembering the night the Uchiha clan was killed] I was so young. I thought it was all merely an illusion. I desperately wanted to believe I was just trapped in a horrible genjutsu. But there was no mistake! I was trapped in reality! My eyes are not the same as they once were. My Sharingan can see through genjutsu!
Confidence is fine. But Sasuke, it appears you still do not possess the same eyes as I do. So you just couldn't do it. Couldn't kill your best friend. And you dared to come here to face me with such weak resolve?
Sasuke
All right, then just hurry it up and try to kill me with your Mangekyo Sharingan. Or am I too strong now for you to test your capabilities against mine?
The Mangekyo Sharingan are very special eyes. The moment they awaken, they progress toward darkness. And the more they're used, the faster they're sealed.
Ah but the ordinary Sharingan is still a weapon and a weapon can be either strong or weak, depending on the ability of the person who is wielding it. Someone's shuriken might be taken down by a mere pebble if it's thrown by a master. The difference is in the power, the variation of strength. It means that Sasuke's skills far exceed Itachi's expectations.
Sasuke
Like I told you, no matter how much you use your eyes, with all of my hatred, I'll turn fantasy into reality.
Turn fantasy into reality huh? Some strong words. And let me throw them back at you now. Just a few minutes ago you saw your eyes gouged out during the Tsukuyomi. Well allow me to make that a reality.
Yes the one other jutsu. Once the Tsukuyomi and Amaterasu were awakened, it also took root in this eye of mine. Sasuke, is that it for your Jutsu then? If you have anything else up your sleeve, now's your last chance to play it. The real battle's just beginning.
You're not making this easy. I suppose that's only natural hearing this from a complete stranger, but what I'm telling you is the truth. Itachi did mention it, didn't he? That he wasn't alone that night, that he had an accomplice. I am Madara Uchiha. I know everything there is to know about Itachi. I suppose Itachi died without realizing that.
Sasuke
Shut up! None of that matters anymore! Just get out of my sight, you hear me?
No, you listen. You need to hear this. It's your obligation. It's about the life of your brother who risked everything for the sake of the shinobi world, the Hidden Leaf Village, and most of all for you, his little brother. You will know how Itachi Uchiha lived.
[Last words, pokes Sasuke's forehead] Forgive me Sasuke, but this is it.
Sasuke
[in the present] We are no longer the Hebi. From this day on, this team will be the Taka. And Taka has but one goal. Our mission... [Awakens his Mangekyo Sharingan] is to destroy the Hidden Leaf.
The reason why Itachi couldn't bring himself to kill me was because my life was more precious to him than the village itself was. I have similar feelings that Itachi's life is more precious than the Hidden Leaf. That's all. They shunned the Uchiha clan! They ordered my brother to kill his own parents! It wasn't just the elders who chased Itachi to his death, but all those in the Hidden Leaf who abide by the Senju! To me they are all the scum of the Earth! They are all objects of my vengeance! If you want to ridicule me as a brat swayed by his emotions, go ahead. To accept and adopt Itachi's intentions would be childish. The foolish sputtering of those who don't know hatred. If anyone who criticizes my way of life were to come forward, I'd turn around and kill every single one of their loved ones so that they too could grasp what it's like to experience this hatred of mine.
Sasuke, I've told you this before and I don't like to repeat myself, but I'll say this once more. [flashes back to saying these words] Let it go. You've got to forget about revenge.
Sasuke
[Laughs maniacally] Itachi, my father, my mother, my entire clan! Bring them all here to me! Do that and I'll quit right now!
Do you really think you can kill me at any moment you wish? Stop acting like you're still my sensei! Go ahead and try something if you like, I'm just itching to kill you, Kakashi!
[insane] All the laughter, every one of you is laughing! Itachi sacrificed his life but you're still laughing, cackling together like fools you're just ignorant of EVERYTHING! I can hear nothing but contempt and jeering in your voices. I want to change those laughs to screams and wails of misery!
Not long ago I finally got my revenge on the one behind Itachi's betrayal. I took down a high ranking Hidden Leaf elder right here, the one called Danzo.
I've never felt like this before. I can feel the tainted Uchiha name becoming cleansed, I feel the Uchiha at last being freed from this rotting shinobi world. You couldn't even begin to understand it. And besides, isn't what I'm doing exactly what you Leaf shinobi have wanted all along? You've always snubbed and put down the Uchiha clan, so I'll simply help erase the Uchiha from your memories... by killing all of you and then destroying the Hidden Leaf Village! Severing all bonds with the Hidden Leaf will be the ultimate purification and that shall lead to the Uchiha's true restoration!
Naruto, no matter what you say to me, I'm not changing. I'm still going to kill each and every person in the Hidden Leaf, including you! I'll get revenge for the Uchiha clan.