Although I agree with the sentiment of uncertainty being valuable I’m not sure how much intelligence produces doubt.
Russell was morally courageous, and probably more perceptive on political issues than many people — but there were plenty of times when he was cussed, and overly certain despite his intelligence. Of course, I’m not expecting sainthood from him — he probably led a better life than me.
This goes back to the point in the article about there being a difference between intelligence, and thought — an intelligent man can be an unthinking man.
Plenty of intelligent men were, and are very, very flawed. And possibly over sure of themselves because of their intelligence.
Names in the 20th century: Heidegger, Carl Schmitt, and György Lukács.