The epistemological position of Kant's critical philosophy ends in a traditional question: how to explain the relationship between faith and moral behavior. As Pascal has done in the Wager's argument, Kant's rational faith pretends to demonstrate its rationality through morality rather than by theoretical or logical arguments. In this paper I wish to argue about two points: 1) both philosophers appear particularly close in the aim of advising about that relationship; 2) they are also very close in the purpose of provide us a << subjective ground >> for believing in God's existence accepting moral imperatives.