Speaking of livers,' the unicorn said. 'Real magic can never be made by offering up someone else's liver. You must tear out your own, and not expect … - Peter S. Beagle

Real magic can never be made by offering someone else's liver. You must tear out your own, and not expect to get it back.

...no cat out of its first fur can ever be deceived by appearances. Unlike human beings, who enjoy them.

We give them different names, those nights lit only by fire and the moon, depending on the country and the calendar, but we know what they are. They call up the world that was before the Lord came down among us; the world where good and evil were not so certain, so fixed as they are today, where the known and the unheard-of could mingle as they chose...where truth had its doubts, do you see?
(By Moonlight)

The magic on you is only magic and will vanish a soon as you are free, but the enchantment of error that you put on me I must wear forever in your eyes. We are not always what we seem, and hardly ever what we dream.