Sartre: Freedom, Bad Faith, and the Thesis that Existence Precedes Essence

“Man is condemned to be free.” Few sentences sum up a philosopher so well, and few have been so often repeated and so badly understood. Jean-Paul Sartre was the public face of twentieth-century existentialism — novelist, playwright, militant, and intellectual celebrity — but behind the media figure lies a rigorous philosophical system built on an ontology of consciousness. This article focuses on the properly Sartrean theses: the distinction between the in-itself and the for-itself, the formula “existence precedes essence,” radical freedom and its weight, bad faith, and the experience of the Other. For an overview of the existentialist movement as a whole, see the dedicated article on existentialism. ...

3 June 2026 · 10 min · Resumidor de Filosofia

Existentialism — From Anguish to Freedom: Kierkegaard, Heidegger, Sartre, and Beyond

No philosophical movement of the twentieth century shaped culture, literature, and our self-understanding as profoundly as existentialism. Born amid the wreckage of two world wars, the collapse of metaphysical certainties, and the crisis of traditional institutions, it placed at the heart of philosophy what the great systems had overlooked: the concrete, singular, unrepeatable existence of each individual. Existentialism is not a school with a uniform set of doctrines. It is better described as a constellation — a cluster of thinkers who, through diverse and sometimes conflicting paths, converge on one conviction: philosophy must begin with lived experience, with anguish, freedom, and the finitude of the human being, rather than with logical abstractions or totalizing systems. ...

13 May 2026 · 15 min · Resumidor de Filosofia

Hannah Arendt — Political Philosophy, the Banality of Evil, and Vita Activa

Few twentieth-century thinkers confronted the relationship between politics, violence, and freedom with as much intellectual courage as Hannah Arendt (1906–1975). A German Jew driven into exile by Nazism, Arendt witnessed the totalitarian catastrophe firsthand and turned that experience into the driving force of a philosophical body of work that defies classification — neither conventionally liberal, nor Marxist, nor conservative. Her thought reaches for something prior to all ideologies: understanding what it means to act in a world shared with others. ...

9 May 2026 · 11 min · Resumidor de Filosofia

Autonomy in Philosophy: From Kant to Contemporary Bioethics

Introduction: What Is Autonomy? Few philosophical concepts span as many domains — moral, political, existential, legal, medical — as autonomy. The word derives from the Greek autós (self) and nómos (law, rule): to govern oneself, to give oneself one’s own law. In ancient Greece, the term originally designated the condition of póleis that governed themselves by their own laws, free from subjection to a foreign power. An autonomous city was one that exercised sovereignty over its internal organization. ...

8 May 2026 · 12 min · Resumidor de Filosofia

Epictetus

Epictetus Phrygian ex-slave; the Stoic who most lived what he preached. His central distinction structures all Stoic ethics: what depends on us (eph’ hêmin: thoughts, impulses, judgments, desires) vs. what does not depend on us (ouk eph’ hêmin: body, fame, wealth, health). Inner freedom is absolute and cannot be taken by any master. “Bear and forbear” (anékhou kai apékhou). Key Concepts Dichotomy of control: what depends on us vs. what does not depend on us Inner freedom as the only true freedom Prohairesis: the faculty of rational choice — sole complete good Philosophy as a way of life, not abstract theory Influenced by Zeno of Citium — Stoic doctrine Socrates — self-examination Influenced Marcus Aurelius — Meditations are notes of Stoic practice inspired by Epictetus Contemporary cognitive psychology (rational-emotive therapy by Ellis) Works He did not write. Arrian (disciple) recorded: Enchiridion (Manual); Discourses (8 books, 4 preserved). ...

1 January 2026 · 1 min · Resumidor de Filosofia

Friedrich Wilhelm Joseph Schelling

Friedrich Wilhelm Joseph Schelling The most versatile of the German idealists; his thought passed through multiple radically distinct phases. He directly influenced Romanticism and anticipated Existentialism. Phases of thought Phase Central theme Philosophy of Nature (~1797) Nature as visible Spirit, living organism Philosophy of Identity (~1801) Absolute = undifferentiated identity of subject and object Philosophy of Freedom (1809) Evil has positive reality; freedom as abyss Positive Philosophy (late) Concrete existence irreducible; critique of rationalism Key concepts Nature as objectified Spirit: the same activity of the subject, but in unconscious degree Absolute: undifferentiated identity of ideal and real, subject and object — point of indifference Evil and freedom: evil is perverse use of freedom — man can isolate himself from the whole Positive philosophy: concrete existence is prior to any system — anticipates Heidegger and Kierkegaard Influenced by Kant and Fichte — point of departure Spinoza — identity of subject/object Giordano Bruno — animated nature Böhme — evil and freedom Influenced Hegel — dialectic of identity/difference German Romanticism (Schlegel, Novalis) Nietzsche — creative will Heidegger — concrete existence and finitude Works System of Transcendental Idealism (1800); Philosophical Investigations into the Essence of Human Freedom (1809). ...

1 January 2026 · 1 min · Resumidor de Filosofia

Isaiah Berlin

Isaiah Berlin Latvian-British political philosopher and historian of ideas, one of the greatest liberal thinkers of the 20th century. Famous for the distinction between negative and positive liberty, and for his defense of value pluralism against all forms of political utopianism. Key Concepts Negative liberty: the absence of external interference — I am free when no one prevents me from acting. It is freedom from (from obstacles, coercion, interference). Berlin associates it with classical liberalism Positive liberty: the capacity for self-governance, to be one’s own master and realize one’s potential. It is freedom to (for autonomy, for self-realization). Berlin warns that it can be distorted to justify paternalism or authoritarianism Value pluralism: fundamental human values (liberty, equality, justice, fraternity) are objectively real but incommensurable — they cannot be reduced to a single hierarchy without destroying something genuine. Against all moral monism Critique of utopianism: any doctrine claiming to have found the final solution to human problems (Marxism, extreme Enlightenment rationalism) tends toward totalitarianism — the pursuit of perfection is the enemy of liberty Counter-Enlightenment: a tradition of thinkers (Vico, Hamann, Herder) who criticized the universalist reason of the Enlightenment and valued particularity, history, and culture Two concepts of liberty: seminal essay (1958) that structured the liberal-communitarian debate for decades Influenced by Locke, Hume, Mill — British liberal tradition Kant — autonomy and dignity Herder and Vico — cultural pluralism and historicity Machiavelli — incompatibility of political values Influenced John Rawls — debate on liberty and justice Communitarianism (Taylor, Walzer, MacIntyre — against Berlin) Contemporary liberalism and normative political theory Hannah Arendt — political thought Works Four Essays on Liberty (1969); Vico and Herder (1976); The Crooked Timber of Humanity (1990); The Sense of Reality (1996). ...

1 January 2026 · 2 min · Resumidor de Filosofia

Jean-Paul Sartre

Jean-Paul Sartre Philosopher, novelist, and playwright, Jean-Paul Sartre was born in Paris in 1905 and trained at the École Normale Supérieure, where he met Simone de Beauvoir, his lifelong intellectual and romantic companion. A stay in Berlin in the 1930s brought him into direct contact with the phenomenology of Husserl and Heidegger, which would become the foundation of his thought. A prisoner of war in 1940–41 and later a central figure of postwar Parisian intellectual life, he made philosophy a public and engaged activity: he founded the review Les Temps Modernes, drew close to Marxism, and, faithful to his refusal of institutional honors, declined the Nobel Prize in Literature in 1964. His death, in 1980, brought tens of thousands into the streets of Paris. ...

1 January 2026 · 3 min · Resumidor de Filosofia

Johann Gottlieb Fichte

Johann Gottlieb Fichte First post-Kantian to overcome the thing-in-itself. Founder of German Idealism; first rector of the University of Berlin (1810). The Addresses to the German Nation (1808) made him a symbol of German cultural nationalism. Key Concepts Pure Ego as absolute principle: the Ego is not a thing, it is act — free self-positing. Esse sequitur operari: being is the product of acting First thesis: the Ego posits itself (freedom, thesis) Second thesis: the Ego opposes to itself a Not-Ego (the world as necessary obstacle to freedom) Third thesis: Ego and Not-Ego mutually limit each other (synthesis → determined reality) Doctrine of Science: system of knowledge grounded in the Ego as unconditioned condition Late phase: the Ego is manifestation of God — mysticism of the Absolute Influenced by Kant — transcendental subject; overcomes the thing-in-itself Rousseau — freedom as foundation Influenced Schelling — departs from Fichte’s subjective idealism Hegel — overcomes Fichte with the Absolute as process Marx — praxis as human self-creation Works Foundations of the Doctrine of Science (1794); The Vocation of the Scholar (1794); Addresses to the German Nation (1808). ...

1 January 2026 · 1 min · Resumidor de Filosofia

Nikolai Berdiáev

Nikolai Berdiáev Nikolai Alexandrovich Berdyaev (18 March 1874, Kyiv — 24 March 1948, Clamart, France) was a Russian religious and political philosopher, often described as a “Christian existentialist.” Of aristocratic origin, he began as a Marxist — he was even internally exiled under the tsarist regime for his activities — but broke early with materialism toward idealism and Orthodoxy. He took part in the critical collection Vekhi (1909). Expelled from Soviet Russia in 1922, in the episode of the “philosophers’ ships,” he lived in Berlin and then in Clamart, near Paris, where he edited the journal Put and became the best-known voice of Russian thought in exile. He was nominated several times for the Nobel Prize. ...

1 January 2026 · 3 min · Resumidor de Filosofia
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