" Substantial empirical evidence indicates that individual differences in thinking dispositions and intelligence are far from perfectly correlated. Many different studies involving thousands of subjects have indicated that measures of intelligence display only moderate to weak correlations (usually less than .30) with some
thinking dispositions (for example, actively open-minded thinking, need for cognition) and near zero correlations with others (such as conscientiousness, curiosity, diligence). "

― Keith E. Stanovich , What Intelligence Tests Miss: The Psychology of Rational Thought