The fact was that Gustave Moreau derived from no one else. He remained unique in contemporary art, without ancestors and without possible descendants.
Joris-Karl Huysmans. À Rebours
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One day, when reflections of this order had brought him once again to the memory of the time when some one had spoken to him of Odette as of a ‘kept’ woman, and when, once again, he had amused himself with contrasting that strange personification, the ‘kept’ woman — an iridescent mixture of unknown and demoniacal qualities, embroidered, as in some fantasy of Gustave Moreau, with poison-dripping flowers, interwoven with precious jewels
Marcel Proust. In Search of Lost Time [volume 1]
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The painting of Gustave Moreau is the painting of ideas.