The demand for certainty is one which is natural to man, but is nevertheless an intellectual vice. If you take your children for a picnic on a doubtful day, they will demand a dogmatic answer as to whether it will be fine or wet, and be disappointed in you when you cannot be sure.
Bertrand Russell, John G. Slater, Peter Köllner (1997). “Last Philosophical Testament: 1943-68”, p.379, Psychology Press
