This chapter delves into the nature of the pactum as both substantial and functional bond as well as mythical canon of any contractual-constituting initiative in the public and private spheres. The aim is to show that the movement toward the conceptualisation of good faith as an organising principle and implied term in the Common law tradition is due to the need to counterbalance our inhuman condition as made it manifest by the humanitarian façade of the modern constitutional project. This claim is supported by an unconventional method of investigation that will promote the comparison between the role of political action at the public level and the increasing utilisation of the doctrine of good faith in Contract law theory and practice.