Which of the following people would you say is the most admirable: Mother Teresa, Bill Gates or Norman Borlaug?

The Moral Instinct

Illustration by Adrian Tomine

By STEVEN PINKER

Published: January 13, 2008

Which of the following people would you say is the most admirable: Mother Teresa, Bill Gates or Norman Borlaug? And which do you think is the least admirable? For most people, it's an easy question. Mother Teresa, famous for ministering to the poor in Calcutta, has been beatified by the Vatican, awarded the Nobel Peace Prize and ranked in an American poll as the most admired person of the 20th century. Bill Gates, infamous for giving us the Microsoft dancing paper clip and the blue screen of death, has been decapitated in effigy in "I Hate Gates" Web sites and hit with a pie in the face. As for Norman Borlaug . . . who the heck is Norman Borlaug?

Yet a deeper look might lead you to rethink your answers. Borlaug, father of the "Green Revolution" that used agricultural science to reduce world hunger, has been credited with saving a billion lives, more than anyone else in history. Gates, in deciding what to do with his fortune, crunched the numbers and determined that he could alleviate the most misery by fighting everyday scourges in the developing world like malaria, diarrhea and parasites. Mother Teresa, for her part, extolled the virtue of suffering and ran her well-financed missions accordingly: their sick patrons were offered plenty of prayer but harsh conditions, few analgesics and dangerously primitive medical care.

It's not hard to see why the moral reputations of this trio should be so out of line with the good they have done. Mother Teresa was the very embodiment of saintliness: white-clad, sad-eyed, ascetic and often photographed with the wretched of the earth. Gates is a nerd's nerd and the world's richest man, as likely to enter heaven as the proverbial camel squeezing through the needle's eye. And Borlaug, now 93, is an agronomist who has spent his life in labs and nonprofits, seldom walking onto the media stage, and hence into our consciousness, at all.

I doubt these examples will persuade anyone to favor Bill Gates over Mother Teresa for sainthood. But they show that our heads can be turned by an aura of sanctity, distracting us from a more objective reckoning of the actions that make people suffer or flourish. It seems we may all be vulnerable to moral illusions the ethical equivalent of the bending lines that trick the eye on cereal boxes and in psychology textbooks. Illusions are a favorite tool of perception scientists for exposing the workings of the five senses, and of philosophers for shaking people out of the naïve belief that our minds give us a transparent window onto the world (since if our eyes can be fooled by an illusion, why should we trust them at other times?). Today, a new field is using illusions to unmask a sixth sense, the moral sense. Moral intuitions are being drawn out of people in the lab, on Web sites and in brain scanners, and are being explained with tools from game theory, neuroscience and evolutionary biology.

"Two things fill the mind with ever new and increasing admiration and awe, the oftener and more steadily we reflect on them," wrote Immanuel Kant, "the starry heavens above and the moral law within." These days, the moral law within is being viewed with increasing awe, if not always admiration. The human moral sense turns out to be an organ of considerable complexity, with quirks that reflect its evolutionary history and its neurobiological foundations.

These quirks are bound to have implications for the human predicament. Morality is not just any old topic in psychology but close to our conception of the meaning of life. Moral goodness is what gives each of us the sense that we are worthy human beings. We seek it in our friends and mates, nurture it in our children, advance it in our politics and justify it with our religions. A disrespect for morality is blamed for everyday sins and history's worst atrocities. To carry this weight, the concept of morality would have to be bigger than any of us and outside all of us.

So dissecting moral intuitions is no small matter. If morality is a mere trick of the brain, some may fear, our very grounds for being moral could be eroded. Yet as we shall see, the science of the moral sense can instead be seen as a way to strengthen those grounds, by clarifying what morality is and how it should steer our actions.

The Moralization Switch

The starting point for appreciating that there is a distinctive part of our psychology for morality is seeing how moral judgments differ from other kinds of opinions we have on how people ought to behave. Moralization is a psychological state that can be turned on and off like a switch, and when it is on, a distinctive mind-set commandeers our thinking. This is the mind-set that makes us deem actions immoral ("killing is wrong"), rather than merely disagreeable ("I hate brussels sprouts"), unfashionable ("bell-bottoms are out") or imprudent ("don't scratch mosquito bites").

The first hallmark of moralization is that the rules it invokes are felt to be universal. Prohibitions of rape and murder, for example, are felt not to be matters of local custom but to be universally and objectively warranted. One can easily say, "I don't like brussels sprouts, but I don't care if you eat them," but no one would say, "I don't like killing, but I don't care if you murder someone."

The other hallmark is that people feel that those who commit immoral acts deserve to be punished. Not only is it allowable to inflict pain on a person who has broken a moral rule; it is wrong not to, to "let them get away with it." People are thus untroubled in inviting divine retribution or the power of the state to harm other people they deem immoral. Bertrand Russell wrote, "The infliction of cruelty with a good conscience is a delight to moralists — that is why they invented hell."

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Steven Pinker is the Johnstone Family Professor of Psychology at Harvard University and the author of "The Language Instinct" and "The Stuff of Thought: Language as a Window Into Human Nature."