Søren Kierkegaard
1813 CE – 1855 CE · 19th Century Era
“Truth is subjective; authentic existence demands passionate commitment in the face of uncertainty.”
Biography
Writing under numerous pseudonyms, Kierkegaard attacked Hegel's system for abstracting away the anguish and passion of individual existence. He insisted that the most important truths, about how to live, what to believe, who to become, cannot be captured in systems but must be personally lived and chosen.
Major Works
Key Arguments
Click “Philosophy 101” to read the full exploration of each argument.
The Leap of Faith
Rational argument cannot bridge the gap to religious faith. One must make a passionate, personal leap beyond reason, risking everything on what cannot be proven.
Why it matters: Challenged the Enlightenment's confidence in pure reason and inaugurated existentialism.
The Three Stages of Existence
Human life can be lived at three levels. The aesthetic stage pursues pleasure, novelty, and sensation, but leads inevitably to boredom and despair. The ethical stage commits to duty, responsibility, and universal moral rules, but can become rigid and self-righteous. The religious stage transcends both through a personal relationship with God that demands absolute commitment and cannot be justified by reason or ethics. Each stage is a complete worldview, and the transition between them requires not argument but a leap, a fundamental reorientation of the self.
Why it matters: Anticipated psychology's interest in stages of moral and personal growth, and it challenged the assumption that philosophy could provide a single rational framework for all of human life.
Anxiety and Authentic Selfhood
Anxiety is not a weakness or a disorder, it is the inescapable consequence of human freedom. We are anxious because we face real choices that define who we are, and no rule or system can make those choices for us. The temptation is to flee from anxiety into conformity, to do what 'one does,' to believe what 'one believes,' to vanish into the crowd. Authentic selfhood means facing the anxiety of freedom and choosing to become a specific individual, not a copy.
Why it matters: Laid the foundation for existentialism's central themes decades before Heidegger and Sartre. Kierkegaard's analysis of anxiety, authenticity, and the flight into conformity directly shaped Heidegger's concept of 'das Man' and Sartre's 'bad faith,' and anticipated modern psychology's understanding of existential anxiety.
Lasting Influence
Originated the existentialist tradition. Influenced Heidegger, Sartre, Camus, Tillich, and modern theology.
Your Reading Path
The Companion Guide
Seven eras of philosophy in one volume — reading lists, key terms, journal prompts · $19.99