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What is the nature of faith and doubt?
The nature of faith and doubt is a complex and often confusing concept. Faith is a belief in something without tangible proof, while doubt is the opposite—a lack of belief in something without tangible proof. Both faith and doubt can be seen as a form of trust, but in different ways.
From Wikipedia
Cartesian doubt is a form of methodological skepticism associated with the writings and methodology of René Descartes. Cartesian doubt is also known as Cartesian skepticism, methodic doubt, methodological skepticism, universal doubt, systematic doubt, or hyperbolic doubt.