Fear and Trembling (original Danish title: Frygt og Bæven) is a philosophical work by Søren Kierkegaard, published in 1843 under the pseudonym Johannes de silentio (John of the Silence). The title is a reference to a line from Philippians 2:12, "...continue to work out your salvation with fear and trembling." — itself a probable reference to Psalms 55:5, "Fear and trembling came upon me..." (the Greek is identical).