This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Among the concepts Kierkegaard analyzes under a pseudonym, anxiety receives perhaps the most sustained and paradoxical treatment. The book is The Concept of Anxiety, published under the name Vigilius Haufniensis, and its central claim runs against the ordinary assumption that anxiety is simply an unpleasant symptom to be managed or cured. Haufniensis instead treats anxiety as a fundamental structure of human existence, inseparable from the fact that a human being is free, and his most quoted formula describes it as the dizziness of freedom, which emerges when spirit tries to posit the synthesis of self and looks down into its own possibility. The image is deliberately vertiginous. Anxiety is what it feels like to stand at an edge and become aware that one could, in the next moment, do almost anything.
This is why Haufniensis insists anxiety differs sharply from fear. Fear has an object, a specific danger one can name and flee from. Anxiety has no determinate object at all, because what provokes it is not any particular threat but possibility as such, the sheer openness of a future not yet decided. He describes the resulting state as sympathetic antipathy or antipathetic sympathy, a phrase meant to capture how a person can be simultaneously drawn toward a possibility and repelled by it in the same instant, wanting and dreading the same open door. That double movement is what makes anxiety so hard to describe honestly, since most everyday language for emotion assumes a single direction, wanting something or fearing something, and anxiety refuses to sit still in either category.
Crucially, Haufniensis does not treat anxiety as something a healthy person eventually eliminates. He goes as far as to say that whoever has learned to be anxious in the right way has learned the ultimate, a claim that inverts the usual therapeutic instinct to soothe anxiety away. Anxiety, on this account, is formative rather than merely disruptive, because it is the psychological condition under which genuine choice becomes possible. A being incapable of anxiety would be a being incapable of freedom, since it would never feel the vertigo of standing before real alternatives with nothing external to compel the decision either way.
The Concept of Anxiety connects this analysis to the problem of sin without collapsing anxiety into sin itself. Anxiety precedes the moral choice it accompanies, and Haufniensis is careful to insist that no choice, including the first wrong choice a person makes, can be mechanically predicted or derived from prior causes the way a natural event can. There is always a leap involved, a qualitative break that anxiety makes felt but does not itself determine. This is part of why the book resists any straightforward reading as a treatise on original sin in the traditional theological sense. Haufniensis is less interested in explaining how sinfulness gets transmitted than in describing the psychological condition, anxiety, under which any individual comes to sin freely and for the first time, generation after generation, rather than merely inheriting guilt from Adam as a fact of biology.
Read this way, anxiety is less a diagnosis than a kind of proof, evidence written into ordinary experience that human beings are not simply creatures governed by necessity. The dizziness one feels leaning over a height, or facing an open future with no script to follow, is for Kierkegaard the closest thing to direct acquaintance with one's own freedom, uncomfortable precisely because freedom itself is uncomfortable to actually possess.