Existentialism in the context of Rationalism

German philosophy, meaning philosophy in the German language or philosophy by German people, in its diversity, is fundamental for both the analytic and continental traditions. It covers figures such as Gottfried Wilhelm Leibniz, Immanuel Kant, Georg Wilhelm Friedrich Hegel, Karl Marx, Friedrich Nietzsche, Martin Heidegger, Ludwig Wittgenstein, the Vienna Circle, and the Frankfurt School, who now count among the most famous and studied philosophers of all time. They are central to major philosophical movements such as rationalism, German idealism, Romanticism, dialectical materialism, existentialism, phenomenology, hermeneutics, logical positivism, and critical theory. The Danish philosopher Søren Kierkegaard is often also included in surveys of German philosophy due to his extensive engagement with German thinkers.

The history of philosophy is the systematic study of the development of philosophical thought. It focuses on philosophy as rational inquiry based on argumentation, but some theorists also include myth, religious traditions, and proverbial lore.

Western philosophy originated with an inquiry into the fundamental nature of the cosmos in Ancient Greece. Subsequent philosophical developments covered a wide range of topics including the nature of reality and the mind, how people should act, and how to arrive at knowledge. The medieval period was focused more on theology. The Renaissance period saw a renewed interest in Ancient Greek philosophy and the emergence of humanism. The modern period was characterized by an increased focus on how philosophical and scientific knowledge is created. Its new ideas were used during the Enlightenment period to challenge traditional authorities. Influential developments in the 19th and 20th centuries included German idealism, pragmatism, positivism, formal logic, linguistic analysis, phenomenology, existentialism, and postmodernism.

Theodor W. Adorno (/əˈdɔːrnoʊ/ ə-DOR-noh; German: [ˈteːodoːɐ̯ aˈdɔʁno] ; born Theodor Ludwig Wiesengrund; 11 September 1903 – 6 August 1969) was a German philosopher, musicologist, and social theorist. He was a leading member of the Frankfurt School of critical theory, whose work has come to be associated with thinkers such as Ernst Bloch, Walter Benjamin, Max Horkheimer, Erich Fromm, and Herbert Marcuse, for whom the works of Sigmund Freud, Karl Marx, and G. W. F. Hegel were essential to a critique of modern society. As a critic of both fascism and what he called the culture industry, his writings—such as Dialectic of Enlightenment (1947), Minima Moralia (1951), and Negative Dialectics (1966)—strongly influenced the European New Left.

In an intellectual climate shaped by existentialism and logical positivism, Adorno developed a dialectical conception of history and philosophy that challenged the foundations of both, anticipating the divide that would later emerge between the analytic and continental traditions. As a classically trained musician, Adorno studied composition with Alban Berg of the Second Viennese School, influenced by his early admiration for the music of Arnold Schoenberg. Adorno's commitment to avant-garde music formed the backdrop of his subsequent writings and led to his collaboration with Thomas Mann on the latter's novel Doctor Faustus (1947), while the two men lived in California as exiles during the Second World War. Working at the newly relocated Institute for Social Research, Adorno collaborated on influential studies of authoritarianism, antisemitism, and propaganda that would later serve as models for sociological studies the institute carried out in post-war Germany.

Continental philosophy is a group of Western philosophies first prominent in 20th-century continental Europe that derive from a broadly Kantian tradition of focusing on the individual and society. Continental philosophy includes German idealism, phenomenology, philosophical pessimism, existentialism (and its antecedents, such as the thought of Kierkegaard and Nietzsche), hermeneutics, structuralism, post-structuralism, deconstruction, French feminism, psychoanalytic theory, posthumanism, speculative realism, and the critical theory of the Frankfurt School as well as some Freudian, Hegelian, and Western Marxist views.

There is no academic consensus on the definition of continental philosophy. Prior to the twentieth century, the term "continental" was used broadly to refer to philosophy from continental Europe. A slightly narrower use of the term originated among English-speaking philosophers since the second half of the 20th century, who use it as a convenient catch-all term to refer to a range of thinkers and traditions outside the movement known as analytic philosophy. The term continental philosophy may mark merely a family resemblance across disparate philosophical views; a similar argument has been made for analytic philosophy.

Karl Theodor Jaspers (/ˈjɑːspərz/; German: [kaʁl ˈjaspɐs] ; 23 February 1883 – 26 February 1969) was a German-Swiss psychiatrist and philosopher who had a strong influence on modern theology, psychiatry, and philosophy. His 1913 work General Psychopathology influenced many later diagnostic criteria, and argued for a distinction between "primary" and "secondary" delusions.

After being trained in and practising psychiatry, Jaspers turned to philosophical inquiry and attempted to develop an innovative philosophical system. He was often viewed as a major exponent of existentialism in Germany, though he did not accept the label.

Martin Heidegger (German: [ˈmaʁtiːn ˈhaɪdɛɡɐ]; 26 September 1889 – 26 May 1976) was a German philosopher known for contributions to phenomenology, hermeneutics, and existentialism. His work covers a range of topics including metaphysics, art, religion, and language.

In April 1933, Heidegger was elected as rector at the University of Freiburg and has been widely criticized for his membership and support for the Nazi Party during his tenure. After World War II, he was dismissed from Freiburg and banned from teaching after denazification hearings at Freiburg. There has been controversy about the relationship between his philosophy and Nazism.

Danish philosophy has a long tradition as part of Western philosophy.

Perhaps the most influential Danish philosopher was Søren Kierkegaard, the creator of Christian existentialism, which inspired the philosophical movement of Existentialism. Kierkegaard had a few Danish followers, including Harald Høffding, who later in his life moved on to join the movement of positivism. Among Kierkegaard's other followers include Jean-Paul Sartre who was impressed with Kierkegaard's views on the individual, and Rollo May, who helped create humanistic psychology. Danish philosophy was also strongly influenced by French hermeneutics philosopher Paul Ricœur.

Jean-Paul Charles Aymard Sartre (/ˈsɑːrtrə/, US also /ˈsɑːrt/; French: [saʁtʁ]; 21 June 1905 – 15 April 1980) was a French philosopher, playwright, novelist, screenwriter, political activist, biographer, and literary critic, considered a leading figure in 20th-century French philosophy and Marxism. Sartre was one of the key figures in the philosophy of existentialism (and phenomenology). His work has influenced sociology, critical theory, post-colonial theory, and literary studies. He was awarded the 1964 Nobel Prize in Literature despite attempting to refuse it, saying that he always declined official honors and that "a writer should not allow himself to be turned into an institution."

Sartre had an open relationship with prominent feminist and fellow existentialist philosopher Simone de Beauvoir. Together, Sartre and de Beauvoir challenged the cultural and social assumptions and expectations of their upbringings, which they considered bourgeois, in both lifestyles and thought. The conflict between oppressive, spiritually destructive conformity (mauvaise foi, literally, 'bad faith') and an "authentic" way of "being" became the dominant theme of Sartre's early work, a theme embodied in his principal philosophical work Being and Nothingness (L'Être et le Néant, 1943). Sartre provided an introduction to his philosophy in his work Existentialism Is a Humanism (L'existentialisme est un humanisme, 1946), originally presented as a lecture.

Atheistic existentialism is a kind of existentialism which strongly diverged from the Christian existential works of Søren Kierkegaard and developed within the context of an atheistic world view. The philosophies of Søren Kierkegaard and Friedrich Nietzsche provided existentialism's theoretical foundation in the 19th century, although their differing views on religion proved essential to the development of alternate types of existentialism. Atheistic existentialism was formally recognized after the 1943 publication of Being and Nothingness by Jean-Paul Sartre and Sartre later explicitly alluded to it in Existentialism is a Humanism in 1946.

Christian existentialism is a theo-philosophical movement which takes an existentialist approach to Christian theology. The school of thought is often traced back to the work of the Danish philosopher and theologian Søren Kierkegaard (1813–1855) who is widely regarded as the father of existentialism.

Fyodor Mikhailovich Dostoevsky (11 November [O.S. 30 October] 1821 – 9 February [O.S. 28 January] 1881) was a Russian novelist, short story writer, essayist and journalist. He is regarded as one of the greatest novelists in both Russian and world literature, and many of his works are considered highly influential masterpieces. Dostoevsky's literary works explore the human condition in the troubled political, social and spiritual atmospheres of 19th-century Russia, and engage with a variety of philosophical and religious themes. His most acclaimed novels include Crime and Punishment (1866), The Idiot (1869), Demons (1872), The Adolescent (1875) and The Brothers Karamazov (1880). His Notes from Underground, a novella published in 1864, is considered one of the first works of existentialist literature.

Born in Moscow in 1821, Dostoevsky was introduced to literature at an early age through fairy tales and legends and through books by Russian and foreign authors. His mother died of tuberculosis on 27 February 1837, when he was 15, and around the same time, he left school to enter the Nikolayev Military Engineering Institute (later renamed the Military Engineering-Technical University). After graduating, he worked as an engineer and briefly enjoyed a lavish lifestyle, translating books to earn extra money. In the mid-1840s, he wrote his first novel, Poor Folk, which gained him entry into Saint Petersburg's literary circles. However, he was arrested in 1849 for belonging to a literary group, the Petrashevsky Circle, that discussed banned books critical of Tsarist Russia. Dostoevsky was sentenced to death, but the sentence was commuted at the last moment. He spent four years in a Siberian prison camp, followed by six years of compulsory military service in exile. In the following years, Dostoevsky worked as a journalist, publishing and editing several magazines of his own and later A Writer's Diary, a collection of his writings. He began to travel around Western Europe and developed a gambling addiction, which led to financial hardship. For a time, he had to beg for money, but he eventually became one of the most widely read and highly regarded Russian writers.

The Fall (French: La Chute) is a philosophical novel by Albert Camus. First published in 1956, it is his last complete work of fiction. Set in Amsterdam, The Fall consists of a series of dramatic monologues by the self-proclaimed "judge-penitent" Jean-Baptiste Clamence, as he reflects upon his life to a stranger. In what amounts to a confession, Clamence tells of his success as a wealthy Parisian defense lawyer who was highly respected by his colleagues. His crisis, and his ultimate "fall" from grace, was meant to invoke, in secular terms, the fall of man from the Garden of Eden. The Fall explores themes of innocence, imprisonment, non-existence, and truth. In a eulogy to Albert Camus, existentialist philosopher Jean-Paul Sartre described the novel as "perhaps the most beautiful and the least understood" of Camus's books.

Ṣadr ad-Dīn Muḥammad Shīrāzī, more commonly known as Mullā Ṣadrā (Persian: ملا صدرا; Arabic: صدر المتألهین; c. 1571/2 – c. 1635/40 CE / 980 – 1050 AH), was an Iranian Twelver Shi'i Islamic mystic, philosopher, theologian, and ‘Ālim who led the cultural renaissance in the country during the 17th century. According to Oliver Leaman, Mulla Sadra is arguably the single most important and influential philosopher in the Muslim world in the last four hundred years. Though not its founder, he is considered the master of the Illuminationist (or, Ishraghi or Ishraqi) school of Philosophy, a seminal figure who synthesized the many tracts of the Islamic Golden Age philosophies into what he called the Transcendent Theosophy or al-hikmah al-muta’āliyah.

Mulla Sadra brought "a new philosophical insight in dealing with the nature of reality" and created "a major transition from essentialism to existentialism" in Islamic philosophy, although his existentialism should not be too readily compared to Western existentialism. His was a question of existentialist cosmology as it pertained to God, and thus differs considerably from the individual, moral, and/or social, questions at the heart of Russian, French, German, or American Existentialism.

French philosophy, here taken to mean philosophy in the French language, has been extremely diverse and has influenced Western philosophy as a whole for centuries, from the medieval scholasticism of Peter Abelard, through the founding of modern philosophy by René Descartes, to 20th century philosophy of science, existentialism, phenomenology, structuralism, and postmodernism.

The Phenomenology of Spirit (or The Phenomenology of Mind; German: Phänomenologie des Geistes) is the first published book by Georg Wilhelm Friedrich Hegel. Hegel described the 1807 work, a ladder to the greater philosophical system of the Encyclopaedia of the Philosophical Sciences, as an "exposition of the coming-to-be of knowledge". This development traced through the logical self-origination and dissolution of "the various shapes of spirit as stations on the way through which spirit becomes pure knowledge".

The text marks a development in German idealism. Focusing on topics in consciousness, metaphysics, ethics, and religion, it is where Hegel develops well-known concepts and methods such as speculative philosophy, the dialectic, the movement of immanent critique, absolute idealism, Sittlichkeit, and Aufhebung. It continues to influence Western philosophy, and "has been praised and blamed for the development of existentialism, communism, fascism, death of God theology, and historicist nihilism".

Max Stirner (/ˈstɜːrnər/; German: [ˈʃtɪʁnɐ], 25 October 1806 – 26 June 1856), born Johann Kaspar Schmidt, was a German philosopher, dealing mainly with the Hegelian notion of social alienation and self-consciousness. Stirner is often seen as one of the forerunners of nihilism, existentialism, psychoanalytic theory, postmodernism, individualist anarchism, and egoism.

Born in 1806 in Bayreuth, Bavaria, Stirner's life and work are known largely through a biography by John Henry Mackay. He was orphaned young and raised in West Prussia after his mother's remarriage. Stirner studied at the University of Berlin, where he attended Hegel's lectures. He then moved into teaching and became involved with the Young Hegelians in Berlin. Although he struggled to secure a permanent academic post, Stirner became a fixture in intellectual circles and wrote his most famous work, The Unique and Its Property (German: Der Einzige und sein Eigentum), while supporting himself as a teacher.