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.
Ego roughly literally translates as the conscious mind or consciousness of your own identity.
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"