Anxiety
The philosopher Søren Kierkegaard, in "The Concept of Anxiety" (1844), described anxiety or dread associated with the "dizziness of freedom" and suggested the possibility for positive resolution of anxiety through the self-conscious exercise of responsibility and choosing. In "Art and Artist" (1932), the psychologist Otto Rank wrote that the psychological trauma of birth was the pre-eminent human symbol of existential anxiety and encompasses the creative person's simultaneous fear of – and desire for – separation, individuation, and differentiation.
Knight of faith
If I am anxious about a past misfortune, then this is not because it is in the past but because it may be repeated, i.e., become future. If I am anxious because of a past offense, it is because I have not placed it in an essential relation to myself as past and have in some deceitful way prevented it from being past. If indeed it is actually past, then I cannot be anxious but only repentant. If I do not repent, I have allowed myself to make my relation to the offense dialectical, and by this the offense itself has become a possibility, and not something past. If I am anxious about the punishment, it is only because this has been placed in a dialectical relation to the offense (otherwise I suffer my punishment), and then I am anxious for the possible for the future. Thus we have returned to where we were in Chapter I. Anxiety is the psychological state that precedes sin. It approaches sin as closely as possible, as anxiously as possible, but without explaining sin, which breaks forth only in the qualitative leap. Søren Kierkegaard, "The Concept of Anxiety", Nichol p. 91-92