He hasn’t an enemy in the world—but all his friends hate him. —Eddie Cantor
A bullet can kill the enemy, but a bullet can also produce an enemy, depending on whom that bullet strikes. —Tim O’Brien
The art of war is simple enough. Find out where your enemy is. Get at him as soon as you can. Strike him as hard as you can and keep moving on. —Ulysses S. Grant
The enemy is anybody who’s going to get you killed, no matter which side he’s on.
—Joseph Heller, Catch 22, 1961
You can discover what your enemy fears most by observing the means he uses to frighten you. —Eric Hoffer