Humankind cannot gain something without first giving something in return. To obtain, something of equal value must be lost. This is Alchemy's First Law of Equivalent Exchange. In those days, we really believed that to be the world's one, and only, truth.

A lesson without pain is meaningless. For you cannot gain something without sacrificing something in return.

Even when our eyes are closed, there's a whole world that exists outside ourselves and our dreams.

I want you by my side. Forever. (Full Metal Alchemist)

We're going to start walking again. We can't stand still, you know. Not as long as we're still alive.

It’s ironic that as scientists that don’t believe in god, were the ones that are closest to god.

So that the new generation that will be born can enjoy happiness. To pay the cost we will have to shoulder corpses and cross a river of blood (Riza Hawkeye -- Fullmetal Alchemist)