Final answer:
Pascal's 'Wager' is based on the supposition that betting on the belief in God can lead to significant gains in the afterlife, while not believing can result in a significant loss. It appeals to emotions and suggests that it is rational to bet on the existence of God.
Step-by-step explanation:
Pascal's 'Wager' is based mainly on the supposition that if we believe in the existence of God and act accordingly, we stand to gain a great reward in the afterlife, while if we do not believe, we stand to suffer a significant loss. The 'Wager' is not a knowledge-based argument, but rather an appeal to our emotions, our fear of punishment and our hopes for rewards. It suggests that it is rational to bet on the existence of God, even without conclusive evidence.