“Your own thoughts can be your worst enemy!”
“Your Worst Enemy Could Be Your Best Friend && Your Best Friend Your Worst Enemy”
“Love can either be your greatest companion or your worst enemy, depending on your pride to accept or deny things.”
“You can be your own biggest enemy or your own greatest ally.”
“You are your own worst enemy. If you can learn to stop expecting impossible perfection, in yourself and others, you may find the happiness that has always eluded you.”
“Your worst enemy, he reflected, was your own nervous system. At any moment the tension inside you was liable to translate itself into some visible symptom.”