Søren Kierkegaard

Fear was a major topic for Søren Kierkegaard, who wrote Frygt og Bæven in 1843; Frygt og Bæven uses the fairy tale to show how fear within one's belief system can lead to freedom.

under the pseudonym Johannes de silentio

Frygt og Bæven) is a philosophical work by Søren Kierkegaard, published in 1843 under the pseudonym Johannes de Silentio, meaning roughly 'John the Silent' in English.