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Simone de Beauvoir (in her essay "Must we burn Sade?", published in "Les Temps modernes", December 1951 and January 1952) and other writers have attempted to locate traces of a radical philosophy of freedom in Sade's writings, preceding modern existentialism by some 150 years. He has also been seen as a precursor of Sigmund Freud's psychoanalysis in his focus on sexuality as a motive force. The surrealists admired him as one of their forerunners, and Guillaume Apollinaire famously called him "the freest spirit that has yet existed".