…belief is essentially satisfactory; and the state of Cartesian doubt is mere pretence or self-deception. For real doubt is most distressing, and nobody can pass from the naturally satisfied state of belief to a state of distressing doubt, unless some still stronger belief forces him to doubt. We cannot pass from satisfaction to dissatisfaction from sheer dissatisfaction with satisfaction.
http://www.commens.org/dictionary/entry/quote-neglected-argument-reality-god-g-3