Even worse than losing self-confidence, though, is reacting defensively. There are surgeons who will see faults everywhere except in themselves. They have no questions and no fears about their abilities. As a result, they learn nothing from their mistakes and know nothing of their limitations. As one surgeon told me, it is a rare but alarming thing to meet a surgeon without fear. “If you’re not a little afraid when you operate,” he said, “you’re bound to do a patient a grave disservice.

The trouble is that we’ve built our medical system and culture around the long tail. We’ve created a multitrillion-dollar edifice for dispensing the medical equivalent of lottery tickets — and have only the rudiments of a system to prepare patients for the near certainty that those tickets will not win. Hope is not a plan, but hope is our plan.

Equally worrying, and far less recognized, medicine has been slow to confront the very changes that it has been responsible for — or to apply the knowledge we have about how to make old age better. Although the elderly population is growing rapidly, the number of certified geriatricians the medical profession has put in practice has actually fallen in the United States by 25 percent between 1996 and 2010. Applications to training programs in adult primary care medicine have plummeted, while fields like plastic surgery and radiology receive applications in record numbers. Partly, this has to do with money — incomes in geriatrics and adult primary care are among the lowest in medicine. And partly, whether we admit it or not, a lot of doctors don’t like taking care of the elderly.

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Tolstoy recognized this. As Ivan Ilyich’s health fades and he realizes that his time is limited, his ambition and vanity disappear. He simply wants comfort and companionship. But almost no one understands — not his family, his friends, or the stream of eminent physicians whom his wife pays to examine him. Tolstoy saw the chasm of perspective between those who have to contend with life’s fragility and those who don’t. He grasped the particular anguish of having to bear such knowledge alone. But he saw something else, as well: even when a sense of mortality reorders our desires, these desires are not impossible to satisfy. Although none of Ivan Ilyich’s family or friends or doctors grasp his needs, his servant Gerasim does. Gerasim sees that Ivan Ilyich is a suffering, frightened, and lonely man and takes pity on him, aware that someday he himself would share his master’s fate.

Our lives are inherently dependent on others and subject to forces and circumstances well beyond our control. Having more freedom seems better than having less. But to what end? The amount of freedom you have in your life is not the measure of the worth of your life. Just as safety is an empty and even self-defeating goal to live for, so ultimately is autonomy.

This is why the betrayals of body and mind that threaten to erase our character and memory remain among our most awful tortures. The battle of being mortal is the battle to maintain the integrity of one’s life — to avoid becoming so diminished or dissipated or subjugated that who you are becomes disconnected from who you were or who you want to be. Sickness and old age make the struggle hard enough. The professionals and institutions we turn to should not make it worse. But we have at last entered an era in which an increasing number of them believe their job is not to confine people’s choices, in the name of safety, but to expand them, in the name of living a worthwhile life.

And the reason is increasingly evident: the volume and complexity of what we know has exceeded our individual ability to deliver its benefits correctly, safely, or reliably. Knowledge has both saved us and burdened us.

Technological society has forgotten what scholars call the 'dying role' and its importance to people as life approaches its end. People want to share memories, pass on wisdoms and keepsakes, settle relationships, establish their legacies, make peace with God, and ensure that those who are left behind will be okay. They want to end their stories on their own terms. This role is, observers argue, among life's most important, for both the dying and those left behind. And if it is, the way we deny people this role, out of obtuseness and neglect, is cause for everlasting shame. Over and over, we in medicine inflict deep gouges at the end of people's lives and then stand oblivious to the harm done.

To become a doctor, you spend so much time in the tunnels of preparation — head down, trying not to screw up, just going from one day to the next — that it is a shock to find yourself at the other end, with someone shaking your hand and offering you a job. But the day comes.

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Listening to the radio, I heard the story behind rocker David Lee Roth’s notorious insistence that Van Halen’s contracts with concert promoters contain a clause specifying that a bowl of M&M’s has to be provided backstage, but with every single brown candy removed, upon pain of forfeiture of the show, with full compensation to the band. And at least once, Van Halen followed through, peremptorily canceling a show in Colorado when Roth found some brown M&M’s in his dressing room. This turned out to be, however, not another example of the insane demands of power-mad celebrities but an ingenious ruse. As Roth explained in his memoir, Crazy from the Heat, “Van Halen was the first band to take huge productions into tertiary, third-level markets. We’d pull up with nine eighteen-wheeler trucks, full of gear, where the standard was three trucks, max. And there were many, many technical errors — whether it was the girders couldn’t support the weight, or the flooring would sink in, or the doors weren’t big enough to move the gear through. The contract rider read like a version of the Chinese Yellow Pages because there was so much equipment, and so many human beings to make it function.” So just as a little test, buried somewhere in the middle of the rider, would be article 126, the no-brown-M&M’s clause. “When I would walk backstage, if I saw a brown M&M in that bowl,” he wrote, “well, we’d line-check the entire production. Guaranteed you’re going to arrive at a technical error.… Guaranteed you’d run into a problem.” These weren’t trifles, the radio story pointed out. The mistakes could be life-threatening. In Colorado, the band found the local promoters had failed to read the weight requirements and the staging would have fallen through the arena floor.