In short, "I."
possitive ego gives you ambitious to be the best in your field
the negative ego make you to think only to yourself.
2). Beyonce: "You have suuch a big ego, I dont think it will fit. It's too strong, too wide, too big, it just WON'T FIT!!!"
Person that isnt easily tricked: "Hmm..I wonder what THATS supposed to mean"
Ego roughly literally translates as the conscious mind or consciousness of your own identity.