“Enemies of the Heir, beware! You'll be next, Mudbloods!”
“The Chamber Of Secrets had been opened.Enemies of the heir, beware.”
“beware of your most implacable enemy-yourself.”
“Beware when your enemy's too easily defeated.”
“Beware the lollipop of mediocrity; lick it once and you'll suck forever.”
“Try walking a mile in your enemy's shoes. You'll be a mile away and you'll have his shoes.”