Know what you are!

"Everyone sees what you seem to be, but few know what you are."
-- Niccolo Machiavelli

Good to remember this from time to time, sometimes the personality people see or rather want to see in you, eludes you of what you truly are. Therefor it is important to have some people in your life (friends or even foes) who can really see through you, and remind you of your true self.