You know your friends, right? 
You also know your enemies, yes?
Or do you?
Certainly in ever evolving relationships, one can become friend or foe, given the best circumstances.
In either case, it is wise to KNOW who to welcome into your lair. Whether they be lion or kitty.
Be sure you know…and act accordingly.
This story will serve as a guide.
~ Courtesy of The 48 Laws of Power by Robert Greene
In 1971, during the Vietnam War, Henry Kissinger was the target of an unsuccessful kidnapping attempt, a conspiracy involving among others, the renowned antiwar activist priests the Berrigan brothers, four more Catholic priests, and four nuns. In private, without informing the Secret Service or the Justice Department, Kissinger arranged a Saturday-morning meeting with three of the alleged kidnappers.
Explaining to his guests that he would have most American soldiers out of Vietnam by mid-1972, he completely charmed them. They gave him some “Kidnap Kissinger” buttons and one of them remained a friend of his for years, visiting him on several occasions.
This was not just a one time ploy; Kissinger made a policy of working with those who disagreed with him. Colleagues commented that he seemed to get along better with his enemies than with his friends.