The content below is an expanded version of a forum post.
You must have noticed that people have huge egos. I'm one of them :D. I'm slowly hacking away its ever growing branches. I noticed that the less I let my Ego rule me, the faster I progress. I've come to recognize it as surrender.
The Ego is an automated defense mechanism, which has evolved for only one purpose - survive and procreate. Its very useful, brutal and is like an autopilot, you don't need to think much, it does it for you. Now, the problem is - it has very limited wisdom, its like an AI, a machine, and it decides on its own what it needs to defend. So it defends the body (of course that's wise), it defends your food, shelter, your hoard of shiny stuff. That's why you don't like when someone touches you, or stares at your food, or enters into your house or steals your belongings. You want to obliterate the intruder. That's Ego in action.
So far so good, the trouble starts when it encroaches into mind stuff, and calls it its own part. So things you know, things you say and things you believe all become something that must be defended from anyone or anything that dares to oppose or destroy them. So the things you "know for sure" must remain so, ego will stand between them and any new knowledge that might try to replace it (
Oh I know everything now). The things you have already said must not be changed, no one should dare to call them stupid, they are just perfect, the total truth, and same for your actions (
I cannot be wrong, I am fair and just). The Ego will hang on to the last straw to "prove" and thus save your words and deed.