[Exposition in the Thomistic Studies 2014: ens­-esse; the return to the fundament] This work is about Modern formalism or essentialism. After having seen some historical works about the sources of Saint Thomas Aquinas’ thought, these two works about scholastic and modern formalism are focused on showing a wrong understanding of the primacy of  the actus essendi in the ens. The main thesis I want to show has three branches: 1) First, there is a continuous path of the forgetfulness of …