Ego: an inflated feeling of pride in your superiority to others
Ego makes me want to lift weights that are heavier than I can handle, leading to incorrect form, injuries, and no progress.
Ego makes me too proud to ask for advice from people who know more than me, either because I'm secretly jealous of them or because I think I'm too good to need advice.
Ego makes me too proud to learn from people who know less than me, too. Just because they know less doesn't mean they don't know something I don't. Or I could be wrong in assuming they know less -- I won't know until I listen to them.
Ego makes me think that I'm special, that I can handle things other people can't. Sometimes this is true. Usually, it's not.
Ego gives me a big head. So do steroids. That means, logically, ego also shrinks my testicles. If you don't think about that one too much, it almost sounds like some sort of wise saying or something. Confucius say, "Ego shinks your testicles."
Ego prevents me from clearly assessing my strengths and weaknesses. And if I can't see myself accurately, I can't improve myself optimally.
Ego keeps me from doing everything I can to get stronger, since I already think I'm a badass.
Ego makes me a jerk. And if I'm a big enough jerk, nobody at the gym will help me out if I'm stuck under a heavy bench press.
Ego makes me dismiss the way other people train if I don't agree with it or understand it, when I should be trying to figure out why they're doing what they do and learning from it.
Ego makes me self-satisfied. It robs me of my fire, my desire to improve myself and work as hard as I can to get stronger every day.
Ego makes me scared to try new things, because I might fail at them. And failing, while great for growth and learning, is terrible for one's sense of superiority.
Ego makes me refuse to admit when something's not working. Stubbornly, I keep plugging away despite not seeing any results because I know I'm right.
Conclusion: Do my best to ignore my ego. Lift smart. Learn. Work hard. Be honest with myself. And then work harder.