This thesis aims to inform contemporary theologians about the vehement theological debate, which broke out between the European scholars in the seventeenth century and the French genius, Blaise Pascal, over the article he wrote, “On the Grace of God.” In his article, Pascal commented on each role of the Grace of God and the free will of man regarding the Salvation of man. He evaluated the opinion of Saint Augustinus as the most appropriate; From here, Pascal analyzed, one by one, the theological opinions of Pelagius, Molina, a Spanish theologian, and Jean Calvin, a theologian of Geneva. He placed Augustinus`s opinion in the center of his analysis, the opinions of Pelagius and Molina on the left side, and Calvin`s opinion on the right. According to Pascal, the opinions of Pelagius and Molina favored the free will of man, while the opinion of Calvin, held closely to the absolute will of God. The former offered a relative importance to the role of man, and the latter to the role of God. Pascal admitted “predestination.” According to him, the concept of selection related to the descendants after the original sin of Adam. European theologians of the seventeenth century divided the will of God into two types: absolute will and conditional will. By the former, God inevitably delivers the saints to salvation, and by the latter, He delivers them to salvation, only if they want to do good, and by accepting the grace of God, but He does not deliver them to salvation if they don not want it. The theologians also divided the grace of God into two types: sufficient grace and effective grace. God equally shares sufficient grace to all human beings. To accept it or not is dependent upon the free will of the person. However, God prepares effective grace to only the people of salvation. If the person receives this grace, their will moves toward the good and they attain salvation. In his article “On the geometric spirit,” Pascal developed his mathmatical concepts into theological applications. Man is a dual being who exists between two infinities. Therefore, he contains a contradiction in his existence. There is a connection of imbalance between man and God. Pascal locates the conditionnal will of God and the sufficient grace of God before the corruption of Adam, and locates the absolute will of God and the effective grace of God after the corruption of Adam. According to him, salvation originates from the will of God, while judgment originates from the will of man.