Do you have an ego?
No one likes to admit having an ego but no one likes to lose all the time do they?
This my, friend is an ego.
We all have one whether we admit it or not, and you can learn from it or you can let it destroy you.
An example of the negative of an ego is being bettered (not beaten) in Chi Sau, getting fed up, believing you are not improving and then to just pack it in – Ego wins.
An example of the positive of an ego is being again bettered (not beaten) in Chi Sau but deciding to learn why you were bettered and how you can improve upon this, ultimately preventing this from happening again – Ego loses.