Jennifer Garvey Berger in Unlocking Leadership Mindtraps:

"When we are uncertain, we search around for understanding and we learn; when we know we're right, we are closed to new possibilities. When leaders believe they are right in a complex world, they become dangerous, because they ignore data that might show them they are wrong; they don't listen well to those around them; and they get trapped in a world they have created rather than the one that exists."