Starting from Caldarone's book on Pascal, the article stresses at least three points: (1) it emphasizes how properly modern is Pascal's insistence on human duplicity; (2) it reads the moved and contradictory character of the Pascalian Christian as a synonym of existential vivacity and authenticity, (3) it throws light on the reasons that make the confrontation between Pascal and Heidegger, via Nietzsche, an unbridgeable gap.