Be ambitious with your learning and humble with your opinions.

Those two settings belong on different dials, and most of us get them the wrong way round. Being hungry about what you can learn costs you nothing but effort, while being certain about what you already think closes the door on the next correction. The combination worth aiming for is wide open on the way in and provisional on the way out. Confidence in your conclusions and appetite for new information pull against each other.

So practise saying that you are not sure, out loud, when you are not. Then go and find out. Read the argument against your own position until you can state it fairly.