The Law of Equivalent Exchange, Waking up in a Led Zeppelin Song, The End of Summer Vacation

"Humankind cannot gain anything without first giving something in return. To obtain, something of equal value must be lost. That is alchemy's first law of Equivalent Exchange. In those days, we believed that to be the world's only truth. But the world isn't perfect, and the law is incomplete. Equivalent Exchange only encompasses some things that go on h…