than live my life as if there isn't, and die to find out there is. - Albert Camus
This is akin to Pascal's Wager from the 17th century which "is an attempt to justify belief in God not with an appeal to evidence for his existence but rather with an appeal to self-interest." - http://www.philosophyofreligion.info/theistic-proofs/pascals-wager
The Wager suggested "that even though the existence of God cannot be determined through reason, a person should wager as though God exists, because living life accordingly has everything to gain, and nothing to lose...
Historically, Pascal's Wager was groundbreaking as it had charted new territory in probability theory, was one of the first attempts to make use of the concept of infinity, marked the first formal use of decision theory, and anticipated the future philosophies of pragmatism and voluntarism." - http://en.wikipedia.org/wiki/Pascal's_Wager
Also see The Argument from Pascal's Wager by Peter Kreeft
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