The article focuses on Blaise Pascal, the mathematician, physicist and philosopher and his notion of delectation. The first text which Pascal devotes to analyzing unbelief and the process of persuasion is the "Art de persuader." The text clearly shows the influence of the Port-Royal tradition but its shifting terminology poses a number of problems. Pascal begins by stating that there are two ways in which opinions can be received into the soul, through the entendement, the natural but not the most common method or through the volonté the normal method but one which people are ashamed to admit to. But how without appeal to the intellect can Pascal hope to change the unbeliever's emotional responses. It is of course evident that the choice of facts is made particularly with a mondain unbeliever in mind, for while the success of Pascal's presentation from the unbeliever's point of view lies in the accuracy of its observation, its success from Pascal's lies in the way he can, through his observation, modify the way the unbeliever sees the world. His aim is to alter his angle of vision, to offer him a new perspective.