“If one must have a worst enemy, it is best to choose a former lover, who will know best how to tempt and torment.”
“Best friends make the worst enemies, they know all your secrets and how to hurt you the most.”
“Your Worst Enemy Could Be Your Best Friend && Your Best Friend Your Worst Enemy”
“The best -- or chasing it -- is the worst enemy of the good.”
“And I was holding someone who was destined to be my best friend, or possibly my worst enemy.”
“I have seen the best of you, and the worst of you, and I choose both.”