“By the time you're thirty, your worst enemy is yourself.”
“In times of rapid change, experience could be your worst enemy.”
“Your Worst Enemy Could Be Your Best Friend && Your Best Friend Your Worst Enemy”
“Forbearance is a maiden's worst enemy. If you're happy, that's all that counts.”
“Your own thoughts can be your worst enemy!”
“Alcohol may be man's worst enemy, but the bible says love your enemy.”