Fear is the enemy of logic. Frank Sinatra
The supreme art of war is to subdue the enemy without fighting. Sun Tzu
Now the reason the enlightened prince and the wise general conquer the enemy whenever they move and their achievements surpass those of ordinary men is foreknowledge. Sun Tzu
Beware, the enemy lies under your blanket. Indonesian Proverb
The friend who helps me and the enemy who does me no harm, make a pair of earrings. Armenian Proverb
There are three kinds of enemy: the enemy himself, the friends of your enemy, and the enemies of your friends. Persian Proverb