Eros and Civilization: A Philosophical Inquiry into Freud (1955; second edition 1966) is a book by the German philosopher and social critic Herbert Marcuse, in which Marcuse proposes a non-repressive society and attempts a synthesis of the theories of Karl Marx and Sigmund Freud; it has been suggested that the work also reveals the influence of Martin Heidegger. The title of Eros and Civilization alludes to Freud's Civilization and Its Discontents (1930). One of Marcuse's best known works, and the book with which he achieved international fame, Eros and Civilization has been compared to books such as Norman O. Brown's Life Against Death (1959). Eros and Civilization helped shape the subcultures of the 1960s. The 1966 edition has an added "political preface".