Since we can never know anything for sure, it is simply not worth sear — Certainty

"Tiedens and Linton (2001) posit that, ―the experience associated with some emotions, such as anger and contentment, can lead to feelings of certainty, while emotions such as surprise, fear and worry can lead individuals to feel uncertain or unsure about their current situation (973). As Tiedens and Linton (2001) argue, the uncertainty which emerges from affect leads individuals to a state of ―bounded rationality. According to Croskerry (2002), ―this is significant for reasoning ability in that individuals in a state of emotionally aroused bounded rationality may fail to consider other important information presented once they have reviewed information that satisfies their own interest (1186). Particularly, individuals might miss specific details or cues needed to better reason. Consequently, when individuals are in a heightened affective state, they might be less likely to process information efficiently, and subsequently, be incapable of attaining a rational conclusion."

"If you tried to doubt everything you would not get as far as doubting anything. The game of doubting itself presupposes certainty."

"No disorders have employed so many quacks, as those that have no cure; and no sciences have exercised so many quills, as those that have no certainty."

"There is no such thing as absolute certainty, but there is assurance sufficient for the purposes of human life."

"We may not be able to get certainty, but we can get probability, and half a loaf is better than no bread."

"What certainty can there be in a Philosophy which consists in as many Hypotheses as there are Phenomena to be explained. To explain all nature is too difficult a task for any one man or even for any one age. Tis much better to do a little with certainty, & leave the rest for others that come after you, than to explain all things by conjecture without making sure of any thing."