Pascal’s wager

418. [...] Let us the examine this point, and let us say: ‘Either God is or he is not’. But to which view shall we be inclined? Reason cannot decide this question. Infinite chaos separate us. At the far end of this infinite distance a coin is being spun which will come down heads or tails. How will you wager? 

[...]Let us weigh up the gain and the loss involved in calling heads that God exists. Let us asses the two cases: if you win you win everything, if you lose you lose nothing.

[...] I tell you that you will gain even in this life, and that at every step you take along this road you will see that your gain is so certain and your risk so negligible that in the end you will realize that you have wagered on something certain and infinite for which you have paid nothing.

Blaise Pascal - Pensées