The book glorifies the impulses and rejects the reality of absolutes, and dismisses all abstractions as meaningless. The measure of all things and the exclusive cause of truth is the individual alone, who is responsible for developing and refining their uniqueness. To this end, the individual is a living fiat, beholden to no one. They have no rights or duties and there’s no law other than power.
An individual’s power alone justifies their actions. To establish their will, the Unique fights with everything they have to annihilate anything that stands in the way of their progress.
In 1856, Stirner died in wretched poverty, utterly forgotten. His philosophy proved to be more durable.