Søren Kierkegaard (1813-1855) lived almost his whole life in Copenhagen. He studied theology, broke off his engagement to Regine Olsen in 1841 (a decision that haunted him), and poured out a stream of books in the 1840s, many under pseudonyms so that readers would weigh each viewpoint on its own terms. He is often called the father of existentialism, though the word did not exist in his lifetime.
The single individual
Kierkegaard's central concern was the single individual standing before God and before his own life. He attacked two things that, in his view, swallowed the individual. One was Hegel's philosophy, which presented history as the unfolding of reason, so that each person became a small moment in a vast system. The other was the comfortable “Christendom” of Denmark, where everyone was a church member by birth and nobody needed to wrestle with what faith demanded. In his last years he attacked the Danish state church openly.
Against both, he argued that the most important truths cannot be learned at a distance. In the Concluding Unscientific Postscript (1846) he claimed that truth is subjectivity. He did not mean that anything is true if you believe it. He meant that the deepest truths concern how a person relates to them, with passion and commitment. Knowing facts about Christianity is not the same as being a Christian.
The three stages
Kierkegaard described three stages, or spheres, of existence:
- The aesthetic: a life devoted to pleasure, interest and avoiding boredom. The aesthete, sketched in Either/Or (1843), flits from enjoyment to enjoyment, keeps every option open and avoids commitment. Kierkegaard thought this life ends in boredom and despair.
- The ethical: a life of commitment to duties and universal moral rules, symbolized by marriage, work and citizenship. The ethical person chooses himself and takes responsibility.
- The religious: a personal relationship to God that may go beyond anything universal ethics can explain.
One does not slide from one stage to the next by reasoning. Each move requires a choice, which Kierkegaard often called a leap.
Abraham and the leap of faith
In Fear and Trembling (1843), written under the pseudonym Johannes de silentio, Kierkegaard retells the story of Abraham, commanded by God to sacrifice his son Isaac. Judged ethically, Abraham is about to commit murder, yet he is honored as the father of faith. Kierkegaard uses the story to ask whether faith can override universal ethics, which he called a teleological suspension of the ethical. He does not soften the horror; he insists that faith, if real, is terrifying and cannot be fully explained to others. Abraham is the knight of faith, who gives everything up and yet trusts that he will receive it back.
The phrase leap of faith is a popular summary rather than Kierkegaard's exact expression, but it captures his idea: faith is not the conclusion of a proof; it is a passionate commitment made in the face of objective uncertainty.
Anxiety and despair
Kierkegaard also wrote The Concept of Anxiety (1844) and The Sickness unto Death (1849). Anxiety, he said, is the dizziness of freedom, the feeling of standing before open possibility. Despair is deeper: failing to be the self one truly is, either by refusing to be oneself or by desperately trying to be a self of one's own invention, cut off from God. For Kierkegaard, the cure for despair was faith. Later secular existentialists kept his analysis of anxiety and choice while dropping his answer, which is why a devout Christian became the ancestor of an often atheist movement.
Worked example: one life, three stages
Imagine Johan, a figure in the spirit of Kierkegaard's pseudonymous books. Kierkegaard did not tie the stages to ages, but following one invented life helps make them concrete.
At twenty-five, the aesthetic. Johan travels, falls in and out of love, and moves jobs whenever things become routine. He prides himself on keeping his options open. Yet he notices that every new pleasure fades faster than the last, and on quiet evenings a gray boredom settles in. Kierkegaard would say his life has no center; he is many moods but not yet a self.
At thirty-five, the ethical. Johan marries, takes a permanent post as a teacher and commits to his community. He did not reason his way here; at some point he simply chose to bind himself. He now judges his life by duties anyone could recognize: keeping promises, caring for his family, doing his work well.
At fifty, the religious. Johan comes to feel called to give up his comfortable post and serve in a distant mission, a decision his family thinks irresponsible. He cannot justify it by universal rules, and he cannot make others understand. This is a small echo of Abraham's position: a commitment that steps beyond what ethics can explain, made in fear and trembling.
Two lessons follow. First, each step involved a leap, not a proof. Second, Kierkegaard's account of the religious stage is deliberately unsettling. A reader can admire his analysis of commitment while doubting whether any calling could justify what Abraham was asked to do.