They had met a few years before, when Michael had been visiting the stables just as a wild horse got loose. Basilius, a young groom from peasant Macedonian stock, had saved Michael’s life. The groom’s strength and courage had impressed Michael, who immediately raised Basilius from the obscurity of being a horse trainer to the position of head of the stables. He loaded his friend with gifts and favors and they became inseparable. Basilius was sent to the finest school in Byzantium, and the crude peasant became a cultured and sophisticated courtier.

Now Michael was emperor, and in need of someone loyal. Who could he better trust with the post of chamberlain and chief councillor than a young man who owed him everything?

Basilius could be trained for the job and Michael loved him like a brother. Ignoring the advice of those who recommended the much more qualified Bardas, Michael chose his friend.

Basilius learned well and was soon advising the emperor on all matters of state. The only problem seemed to be money—Basiiius never had enough. Exposure to the splendor of Byzantine court life made him avaricious for the perks of power. Michael doubled, then tripled his salary, ennobled him, and married him off to his own mistress, Eudoxia Ingerina. Keeping such a trusted friend and adviser satisfied was worth any price. But more trouble was to come. Bardas was now head of the army, and Basilius convinced Michael that the man was hopelessly ambitious. Under the illusion that he could control his nephew, Bardas had conspired to put him on the throne, and he could conspire again, this time to get rid of Michael and assume the crown himself. Basilius poured poison into Michael’s ear until the emperor agreed to have his uncle murdered. During a great horse race, Basilius closed in on Bardas in the crowd and stabbed him to death. Soon after, Basilius asked that he replace Bardas as head of the army, where he could keep control of the realm and quell rebellion. This was granted.

Now Basilius’s power and wealth only grew, and a few years later Michael, in financial straits from his own extravagance, asked him to pay back some of the money he had borrowed over the years. To Michael’s shock and astonishment, Basilius refused, with a look of such impudence that the emperor suddenly realized his predicament: The former stable boy had more money, more allies in the army and senate, and in the end more power than the emperor himself. A few weeks later, after a night of heavy drinking, Michael awoke to find himself surrounded by soldiers. Basilius watched as they stabbed the emperor to death. Then, after proclaiming himself emperor, he rode his horse through the streets of Byzantium, brandishing the head of his former benefactor and best friend at the end of a long pike.

He had created a monster. He had allowed a man to see power up close—a man who then wanted more, who asked for anything and got it, who felt encumbered by the charity he had received and simply did what many people do in such a situation: They forget the favors they have received and imagine they have earned their success by their own merits.

At Michael’s moment of realization, he could still have saved his own life, but friendship and love blind every man to their interests. Nobody believes a friend can betray. And Michael went on disbelieving until the day his head ended up on a pike.

In A.D. 959, General Chao K’uang-yin became Emperor Sung. He knew the odds, the probability that within a year or two he would be murdered ; how could he break the pattern? Soon after becoming emperor, Sung ordered a banquet to celebrate the new dynasty, and invited the most powerful commanders in the army. After they had drunk much wine, he dismissed the guards and everybody else except the generals, who now feared he would murder them in one fell swoop. Instead, he addressed them: “The whole day is spent in fear, and I am unhappy both at the table and in my bed. For which one of you does not dream of ascending the throne? I do not doubt your allegiance, but if by some chance your subordinates, seeking wealth and position, were to force the emperor’s yellow robe upon you in turn, how could you refuse it?” Drunk and fearing for their lives, the generals proclaimed their innocence and their loyalty. But Sung had other ideas: “The best way to pass one’s days is in peaceful enjoyment of riches and honor. If you are willing to give up your commands, I am ready to provide you with fine estates and beautiful dwellings where you may take your pleasure with singers and girls as your companions.”

The astonished generals realized that instead of a life of anxiety and struggle Sung was offering them riches and security. The next day, all of the generals tendered their resignations, and they retired as nobles to the estates that Sung bestowed on them.

In one stroke, Sung turned a pack of “friendly” wolves, who would likely have betrayed him, into a group of docile lambs, far from all power.

Over the next few years Sung continued his campaign to secure his rule. In A.D. 971, King Liu of the Southern Han finally surrendered to him after years of rebellion. To Liu’s astonishment, Sung gave him a rank in the imperial court and invited him to the palace to seal their newfound friendship with wine. As King Liu took the glass that Sung offered him, he hesitated, fearing it contained poison. “Your subject’s crimes certainly merit death,” he cried out, “but I beg Your Majesty to spare your subject’s life. Indeed I dare not drink this wine.” Emperor Sung laughed, took the glass from Liu, and swallowed it himself. There was no poison. From then on Liu became his most trusted and loyal friend.

At the time, China had splintered into many smaller kingdoms. When Ch‘ien Shu, the king of one of these, was defeated, Sung’s ministers advised the emperor to lock this rebel up. They presented documents proving that he was still conspiring to kill Sung. When Ch’ien Shu came to visit the emperor, however, instead of locking him up, Sung honored him. He also gave him a package, which he told the former king to open when he was halfway home. Ch’ien Shu opened the bundle on his return journey and saw that it contained all the papers documenting his conspiracy. He realized that Sung knew of his murderous plans, yet had spared him nonetheless. This generosity won him over, and he too became one of Sung’s most loyal vassals.

Instead of relying on friends, Sung used his enemies, one after the other, transforming them into far more reliable subjects. While a friend expects more and more favors, and seethes with jealousy, these former enemies expected nothing and got everything. A man suddenly spared the guillotine is a grateful man indeed, and will go to the ends of the earth for the man who has pardoned him. In time, these former enemies became Sung’s most trusted friends.

And Sung was finally able to break the pattern of coups, violence, and civil war—the Sung Dynasty ruled China for more than three hundred years.

The problem is that you often do not know your friends as well as you imagine. Friends often agree on things in order to avoid an argument. They cover up their unpleasant qualities so as to not offend each other. They laugh extra hard at each other’s jokes. Since honesty rarely strengthens friendship, you may never know how a friend truly feels. Friends will say that they love your poetry, adore your music, envy your taste in clothes—maybe they mean it, often they do not.

When you decide to hire a friend, you gradually discover the qualities he or she has kept hidden. Strangely enough, it is your act of kindness that unbalances everything. People want to feel they deserve their good fortune. The receipt of a favor can become oppressive: It means you have been chosen because you are a friend, not necessarily because you are deserving. There is almost a touch of condescension in the act of hiring friends that secretly afflicts them. The injury will come out slowly: A little more honesty, flashes of resentment and envy here and there, and before you know it your friendship fades. The more favors and gifts you supply to revive the friendship, the less gratitude you receive.

Ingratitude has a long and deep history. It has demonstrated its powers for so many centuries, that it is truly amazing that people continue to underestimate them. Better to be wary. If you never expect gratitude from a friend, you will be pleasantly surprised when they do prove grateful.

The problem with using or hiring friends is that it will inevitably limit your power. The friend is rarely the one who is most able to help you; and in the end, skill and competence are far more important than friendly feelings. (Michael III had a man right under his nose who would have steered him right and kept him alive: That man was Bardas.)

All working situations require a kind of distance between people. You are trying to work, not make friends; friendliness (real or false) only obscures that fact. The key to power, then, is the ability to judge who is best able to further your interests in all situations. Keep friends for friendship, but work with the skilled and competent.

Your enemies, on the other hand, are an untapped gold mine that you must learn to exploit. When Talleyrand, Napoleon’s foreign minister, decided in 1807 that his boss was leading France to ruin, and the time had come to turn against him, he understood the dangers of conspiring against the emperor; he needed a partner, a confederate—what friend could he trust in such a project? He chose Joseph Fouché, head of the secret police, his most hated enemy, a man who had even tried to have him assassinated. He knew that their former hatred would create an opportunity for an emotional reconciliation. He knew that Fouché would expect nothing from him, and in fact would work to prove that he was worthy of Talleyrand’s choice; a person who has something to prove will move mountains for you. Finally, he knew that his relationship with Fouché would be based on mutual self-interest, and would not be contaminated by personal feeling. The selection proved perfect; although the conspirators did not succeed in toppling Napoleon, the union of such powerful but unlikely partners generated much interest in the cause; opposition to the emperor slowly began to spread. And from then on, Talleyrand and Fouché had a fruitful working relationship. Whenever you can, bury the hatchet with an enemy, and make a point of putting him in your service.

As Lincoln said, you destroy an enemy when you make a friend of him. 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 onetime 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.

Without enemies around us, we grow lazy. An enemy at our heels sharpens our wits, keeping us focused and alert. It is sometimes better, then, to use enemies as enemies rather than transforming them into friends or allies.

Mao Tse-tung saw conflict as key in his approach to power. In 1937 the Japanese invaded China, interrupting the civil war between Mao’s Communists and their enemy, the Nationalists.

Fearing that the Japanese would wipe them out, some Communist leaders advocated leaving the Nationalists to fight the Japanese, and using the time to recuperate. Mao disagreed: The Japanese could not possibly defeat and occupy a vast country like China for long. Once they left, the Communists would have grown rusty if they had been out of combat for several years, and would be ill prepared to reopen their struggle with the Nationalists. To fight a formidable foe like the Japanese, in fact, would be the perfect training for the Communists’ ragtag army. Mao’s plan was adopted, and it worked: By the time the Japanese finally retreated, the Communists had gained the fighting experience that helped them defeat the Nationalists.

Years later, a Japanese visitor tried to apologize to Mao for his country’s invasion of China. Mao interrupted, “Should I not thank you instead?” Without a worthy opponent, he explained, a man or group cannot grow stronger.

Mao’s strategy of constant conflict has several key components. First, be certain that in the long run you will emerge victorious. Never pick a fight with someone you are not sure you can defeat, as Mao knew the Japanese would be defeated in time. Second, if you have no apparent enemies, you must sometimes set up a convenient target, even turning a friend into an enemy. Mao used this tactic time and again in politics. Third, use such enemies to define your cause more clearly to the public, even framing it as a struggle of good against evil. Mao actually encouraged China’s disagreements with the Soviet Union and the United States; without clear-cut enemies, he believed, his people would lose any sense of what Chinese Communism meant. A sharply defined enemy is a far stronger argument for your side than all the words you could possibly put together.

Never let the presence of enemies upset or distress you—you are far better off with a declared opponent or two than not knowing where your real enemies lie. The man of power welcomes conflict, using enemies to enhance his reputation as a surefooted fighter who can be relied upon in times of uncertainty.

Finally, the problem about working with friends is that it confuses the boundaries and distances that working requires. But if both partners in the arrangement understand the dangers involved, a friend often can be employed to great effect. You must never let your guard down in such a venture, however; always be on the lookout for any signs of emotional disturbance such as envy and ingratitude. Nothing is stable in the realm of power, and even the closest of friends can be transformed into the worst of enemies.