On one side, the philosophy of unity; on the other, the philosophy of chance. Incompatible, antagonistic. And both find, it is true, showy fundamentals. Deprived, however, of the certainty, of the complete proof that would annul the opposing argumentation, they fight vainly. As Pascal noted, there seems to be enough in the world for anyone to see what they want. In this way, the fundamental philosophical posture seems to be summarized in the attachment or detachment to uncertainty, in the appreciation of the signs that may or may not satisfy; in short, in the reaction of the spirit before the knowledge acquired.