Clare Carlisle at The Nation:
Even though Kierkegaard treats despair as a spiritual and existential condition rather than just a psychological state, The Sickness Unto Death sparkles with psychological insight. Especially compelling is his diagnosis of the different forms of despair that arise from an imbalance between the various pairs that make up the human synthesis (those first folds in our sheets of paper). Too much necessity, and we lose all imagination and hope—we cannot breathe; too much possibility, and we float airily, ineffectually, above our own lives. Too much finitude, and we lose ourselves in trivial things; too much infinitude, and we’re disconnected from the world. Since life is so rarely in balance, despair is the inevitable state—but understanding this, for Kierkegaard, opens up a renewed perspective on how to live with this inevitability.
The psychology of despair also helps illuminate its politics and sociology. Kierkegaard saw the fact that we are disconnected from ourselves, and from God, as not just an individual problem but an indictment of the modern age.
more here.