Properly original, the new version of this essay intends both to nourish debate and differentiate points of view. In its new articulation, the book justifies work that has been carried out since. It justifies the sense of Franciscan rootedness that has never been denied and at the same time opens to the discovery of another reading of the Dominican Thomas Aquinas. The preface specially composed for this American edition, the opening debate with famous medievalist Etienne Gilson, and above all the afterword entitled "Saint Thomas Aquinas and the entrance of God into Philosophy" make it a radically new book.