In the Infini-Rien fragment of his Pensées, Blaise Pascal develops an argument for the rationality of faith in God, which posthumously became known as Pascal’s Wager and at the same time represents a cornerstone of modern probability theory. While this betting argument has been the subject of much philosophical investigation, the contribution of this paper lies in the following: On the one hand, the bet is reconstructed in its basic features as well as its structure with the help of modern (...) decision and probability theory tools. Thus, it is shown that Pascal’s betting argument, in distinction to Hacking 1972 for instance, has the form of an a fortiori argument. On the other hand, as far as objections to Pascal’s argument are concerned, it is true that the premises have often been called into doubt, more or less convincingly. On the other hand, this article is dedicated to the question, often emphatically – especially in Hacking 1972 – and perhaps carelessly affirmed in Pascal research, whether Pascal’s premises imply his conclusion at all. (shrink)

Pascal's wager is an argument in support of religious belief taking its name from the seventeenth century polymath Blaise Pascal. Unlike more traditional arguments for the existence of God, Pascal's wager is a pragmatic argument, concluding not that God exists but that one should wager for God; that is, one should live as if God exists. After an introduction to the elements of decision theory needed to understand the wager, I discuss the interpretation of Pascal's reasoning in the Infini rien (...) fragment of the Pensees, in which he presents several versions of a wager-style argument. Recent discussions of the role of the wager within Pascal's overall project of Christian apologetics are also examined. I then review contemporary formulations of, attacks on, and objections to Pascal's wager. Recent authors have pressed moral objections, epistemological objections, objections relating to infinite utilities, the many Gods objection, and objections to the expectation rule, among others. After an examination of this literature, I conclude with a brief discussion of noncanonical versions of the wager, including Jeff Jordan's Jamesian wager. (shrink)