" Think of it this way: alchemists of old relied on the energy provided by tides, the moon, sun, planets in alignment. Every experiment was delicate and had to be balanced just so, or there couldn't be a proper result. Obscurists have an inborn talent to provide that energy from within and not from the world around us; we are born with quintessence. "

― Rachel Caine , Paper and Fire (The Great Library, #2)