Related:

• You will triumph over your enemy.
• Be smart as a cat: Make a friend of your enemy's enemy.
• May you croak one day before your worst enemy.
• If you want to hide your face, walk naked.
• If you wish to make a man your enemy, tell him simply, You are wrong.
  This method works every time. -- Henry C. Link...
• Your enemy is never a villain in his own eyes. Keep this in mind
  it may offer a way to make him your friend. If not, you can kill him without hate - and quickly....
• You can discover what your enemy fears most by observing the means he uses to frighten you.
  -- Eric Hoffer, in "The Faber Book of Aphorisms", 1964...