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"Oh, I didn't even have to think for half a second before this quote came into my mind. This quote is. I'm pretty sure it's from the Wicked King, which is the second book in the Folk of the Air series, but it could also be from the Cruel Prince, which is the first book. It is Cardan saying power is very easy to acquire, but much harder to keep hold of. Or maybe it's a Jude saying that."