in love with an idea. An idea can make him ill. ” It’s no surprise Lorca mentions Nietzsche as an example when he talks about duende . This quote is from R. J. Hollingdale’s Introduction (p.11-12) to Thus Spoke Zarathustra 1883-1885 by F. Nietzsche. Translated by R.J.Hollingdale, London: Penguin, 1969. duende