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Why did Lukács decide, in 1960, after having completed the first part of his Aesthetics, to write an ethics? The core of the answer is to be found in a letter to Ernst Fischer, dated March 18th, 1960: « Ethics is the weakest point in our theory. » Lukács's ethics was never written but he began The Ontology of the Social Being which he conceived as a preliminary theoretical detour. In his article, N. Tertulian shows that Lukács's preoccupation with ethics was a lifelong one, with not only considerable variations but also constants which allow one to determine some of the characteristics of the ethics his death prevented him from writing.