"In order to gain something, you must present something of equal value. That is the principle of Equivalent Trade. Back then, i had believed it to be the truth of the world. But as it turns out, the world is an imperfect place, And there is no principle that can explain its existence. Not even the principle of Equivalent Trade. But i still believe that one cannot gain something without paying the price. The pain i endured must have been the price for something else. I also believe that by paying the price of hard work, i can gain something."

"People cannot gain anything without sacrificing something. You must present something of equal value to gain something. That is the principle of equivalent trade in alchemy."

One of my favourite Japanese anime: Full Metal Alchemist