Most of us take pride in our knowledge and expertise, and in staying true to our beliefs and opinions. That makes great sense in a stable world, where we get rewarded for having the conviction of our ideas. The problem is that we live in a rapidly changing world, where we need to spend as much time rethinking as we do thinking.
Rethinking is a skill set, but it's also a mindset. We already have many of the mental tools we need. We just have to remember to get them out of the shed and remove the rust.