Ego gets its identity from different sources that tend to propel us along. Anytime you assert anything, look at the connection between that and that which is feeding off it. This is the self-centeredness, where ego gets its payoff. When it comes in the form of strong beliefs, opinions and concepts, just watch. This is the sitting practice of meditation.

https://www.youtube.com/watch?v=zkB6CiWRDuo