“Memo to extreme partisans: If you can't bring yourselves to love your enemies, can you at least learn to hate your friends?”
“Love your enemies and hate your friends, your enemies remain the same your friends always change”
“General [De Gaulle], you must not hate your friends more than you hate your enemies”
“There's ways you can trust an enemy you can't always trust a friend. An enemy's never going to betray your trust.”
“How do I know I can trust you?''You can't,' he said bluntly. 'You've got to take it on faith that the enemy of your enemy is your friend.”
“Reveal not every secret you have to a friend, for how can you tell but that friend may hereafter become and enemy. And bring not all mischief you are able to upon an enemy, for he may one day become your friend.”