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?

Live your life so that you’ll have no regrets. No matter how hard, no matter how sad, if something is precious to you, protect it with both arms.

I think of you as a friend. I used to think "friend" was just another word... Nothing more, nothing less. But when I met you, I realized what was important was the word's meaning.

Got to keep thatin mind. I'm a ninja now... I swore I'd never freeze up or run away again... AND I WON'T...!

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

That is a considerable amount of puppets. But ... [Proceeds to summon one hundred puppets of his own] With this, I took down a whole country

No, you don't get it, thats why I'm telling you. You think you get it, which isn't the same as actually getting it. Get it? (Kakashi)