Abstract Kierkegaard՚s The Concept of Anxiety deserves to be treated as a central text on sin, but not because it introduces an ingenious intermediate psychological determination that helps to approach an explanation of the „Fall.“ Its real relevance lies in the way the text enacts the noetic effects of sin through a theoretical reflection on the possibility of sin. This essay unfolds this thesis and assigns a central hermeneutical role to Caput 4.