What are Kierkegaard's three stages of existence?

He described three modes of life — not as historical periods but as ways of existing that any person might inhabit:

The Aesthetic Stage: Life organized around pleasure, sensation, and the immediate. The aesthete seeks beauty, variety, romance, excitement — whatever feels good now. This stage offers genuine pleasures but collapses into boredom and despair because pleasure is unsustainable and the self remains unformed. Don Juan is Kierkegaard's archetype here.

The Ethical Stage: Life organized around duty, moral principle, and social responsibility. The ethical person makes commitments — to marriage, to a profession, to a moral code — and holds to them. This is more stable than the aesthetic stage but risks becoming hollow if duties are followed without inner conviction. The responsible citizen is the archetype.

The Religious Stage: Life organized around an individual relationship with God that may transcend conventional morality. This is the stage of Abraham — who was asked to do something that looked, from the ethical stage, like a crime, but who was operating in a relationship with the absolute that could not be explained in ethical terms.

What is the movement between stages?

It is not automatic or progressive. A person can remain at the aesthetic stage indefinitely. Movement requires a kind of despair — recognizing that the current mode of existence cannot sustain meaning — followed by a choice to commit to something larger.

The stages are not hierarchical in the sense of "better = higher." They describe qualitatively different ways of relating to existence, each with its own logic and its own form of despair when followed to its limit.

Where does most modern life fall?

Kierkegaard would probably say we oscillate between aesthetic and ethical — pleasure-seeking punctuated by responsibility — with the religious stage largely absent or reduced to social performance. His challenge would be the same as it was in 1840s Copenhagen: are you actually choosing yourself, or just following the patterns around you?