In "The Castle in the Forest," Norman Mailer reflects on Søren Kierkegaard's caution against overconfidence in one's moral superiority. Kierkegaard argued that individuals should be careful not to become too self-righteous because the origins of such virtuous feelings can be unclear. This perspective invites a deeper examination of one's motivations and the potential illusions of self-assuredness in moral standings.

By highlighting this concern, Mailer emphasizes the complexities of human feelings and the necessity for introspection. He suggests that while striving for goodness is noble, one must remain aware of the potential pitfalls of vanity and self-deception that may accompany a sense of holiness. This idea encourages a more thoughtful approach to morality.