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This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. German author, physician, philosopher, and friend of Friedrich Nietzsche. Rée was born in Bartelshagen, Province of Pomerania, Prussia on the noble estate “Rittergut Adlig Bartelshagen am Grabow” near the south coast of the Baltic Sea. In the history of ideas, he is primarily known as an auxiliary figure through his friendship with Friedrich Nietzsche, rather than as an important philosopher in his own right. Rée’s status as the son of a wealthy businessman and landowner allowed him to study philosophy and law at the University of Leipzig.

The monthly allowance Rée received from his family allowed him to pursue his own interests in his studies. Rée’s book The Origin of the Moral Sensations largely was written in the autumn of 1877 in Sorrento, where Rée and Nietzsche both worked by invitation of Malwida von Meysenbug. The book sought to answer two questions. Published in 1877, The Origin of the Moral Sensations was Rée’s second book. His first was titled Psychological Observations. In The Origin of the Moral Sensations, Rée announced in the foreword that the book was inductive.