Narrator quotes from Fullmetal Alchemist: Brotherhood

One is all, and all is one. All things in this world are connected. The alchemist who opens the Doorway will find the true nightmare.

"Burn it up, all of it."

"Step forward and protect your life, and the world that nurtured it."

Alphonse

We’ve been treated so well. So many people have cared for both of us. And now, for all this compassion, from people like you and Mr. Hughes, we feel like it’s our turn to repay the happiness that’s been given to us.

Isn’t that what the alchemists believe? Equivalent Exchange?

Alphonse

No. It’s equivalent if you take ten and then you give ten back. But if you take ten, and then add something of yourself, you return eleven. It’s not much; but it’s an all new principle that we’re trying to establish. [Laughs] And now we just have to go out and prove that it actually works.