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Pascal's original formulation of the wager was written down as a fairly short paragraph in Pensées amongst several other notes that could be considered "wagers". Its argument is rooted in game theory and that the best course of action is to believe in God regardless of any lack of evidence, because that option gives the biggest potential gains. Pascal's original text is long-winded and somewhat convoluted philosophy-speak, but it can be distilled more simply:
If you believe in God and God does exist, you will be rewarded with eternal life in heaven: thus an infinite gain.
If you do not believe in God and God does exist, you will be condemned to remain in hell forever: thus an infinite loss.
If you believe in God and God does not exist, you will not be rewarded: thus a finite loss.
If you do not believe in God and God does not exist, you will not be rewarded, but you have lived your own life: thus a finite gain.
The gains and losses associated to outcomes 3 and 4 can be thought of as the opportunity costs of feigning belief and living in accordance with religious norms, since these are typically more restrictive than secular laws. These costs are finite because of human mortality. Mathematically, a finite gain or loss is negligible compared to an infinite gain or loss as would be incurred during an eternal afterlife. Therefore, Pascal concluded that it was a much better choice to believe in God rather than not. The Wager can also be seen in table form and it becomes clear that belief gives you a reward or (practically) nothing, while disbelief gives you punishment or nothing: