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© Yuko Shimizu/The New York Times
Last month, in San Jose, Calif., 21 people were treated for burns after walking barefoot over hot coals as part of an event called Unleash the Power Within, starring the motivational speaker Tony Robbins. If you're anything like me, a cynical retort might suggest itself: What, exactly, did they expect would happen? In fact, there's a simple secret to "firewalking": coal is a poor conductor of heat to surrounding surfaces, including human flesh, so with quick, light steps, you'll usually be fine.

But Mr. Robbins and his acolytes have little time for physics. To them, it's all a matter of mind-set: cultivate the belief that success is guaranteed, and anything is possible. One singed but undeterred participant told The San Jose Mercury News: "I wasn't at my peak state." What if all this positivity is part of the problem? What if we're trying too hard to think positive and might do better to reconsider our relationship to "negative" emotions and situations?

Consider the technique of positive visualization, a staple not only of Robbins-style seminars but also of corporate team-building retreats and business best sellers. According to research by the psychologist Gabriele Oettingen and her colleagues, visualizing a successful outcome, under certain conditions, can make people less likely to achieve it. She rendered her experimental participants dehydrated, then asked some of them to picture a refreshing glass of water. The water-visualizers experienced a marked decline in energy levels, compared with those participants who engaged in negative or neutral fantasies. Imagining their goal seemed to deprive the water-visualizers of their get-up-and-go, as if they'd already achieved their objective.

Or take affirmations, those cheery slogans intended to lift the user's mood by repeating them: "I am a lovable person!" "My life is filled with joy!" Psychologists at the University of Waterloo concluded that such statements make people with low self-esteem feel worse - not least because telling yourself you're lovable is liable to provoke the grouchy internal counterargument that, really, you're not.

Even goal setting, the ubiquitous motivational technique of managers everywhere, isn't an undisputed boon. Fixating too vigorously on goals can distort an organization's overall mission in a desperate effort to meet some overly narrow target, and research by several business-school professors suggests that employees consumed with goals are likelier to cut ethical corners.

Though much of this research is new, the essential insight isn't. Ancient philosophers and spiritual teachers understood the need to balance the positive with the negative, optimism with pessimism, a striving for success and security with an openness to failure and uncertainty. The Stoics recommended "the premeditation of evils," or deliberately visualizing the worst-case scenario. This tends to reduce anxiety about the future: when you soberly picture how badly things could go in reality, you usually conclude that you could cope. Besides, they noted, imagining that you might lose the relationships and possessions you currently enjoy increases your gratitude for having them now. Positive thinking, by contrast, always leans into the future, ignoring present pleasures.

Buddhist meditation, too, is arguably all about learning to resist the urge to think positively - to let emotions and sensations arise and pass, regardless of their content. It might even have helped those agonized firewalkers. Very brief training in meditation, according to a 2009 article in The Journal of Pain, brought significant reductions in pain - not by ignoring unpleasant sensations, or refusing to feel them, but by turning nonjudgmentally toward them.

From this perspective, the relentless cheer of positive thinking begins to seem less like an expression of joy and more like a stressful effort to stamp out any trace of negativity. Mr. Robbins's trademark smile starts to resemble a rictus. A positive thinker can never relax, lest an awareness of sadness or failure creep in. And telling yourself that everything must work out is poor preparation for those times when they don't. You can try, if you insist, to follow the famous self-help advice to eliminate the word "failure" from your vocabulary - but then you'll just have an inadequate vocabulary when failure strikes.

The social critic Barbara Ehrenreich has persuasively argued that the all-positive approach, with its rejection of the possibility of failure, helped bring on our present financial crises. The psychological evidence, backed by ancient wisdom, certainly suggests that it is not the recipe for success that it purports to be.

Mr. Robbins reportedly encourages firewalkers to think of the hot coals as "cool moss." Here's a better idea: think of them as hot coals. And as a San Jose fire captain, himself a wise philosopher, told The Mercury News: "We discourage people from walking over hot coals."

Oliver Burkeman is the author of the forthcoming book The Antidote: Happiness for People Who Can't Stand Positive Thinking.