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LEHRER: What are some other examples of how seemingly abstract thoughts, such as feeling excluded, can have physical manifestations?

ZHONG: Another example would be the relation between morality and physical cleanliness. In my early work “Washing Away Your Sins: Threatened Morality and Physical Cleansing” in collaboration with Katie Liljenquist [a professor of organizational behavior at Brigham Young University], we discussed how metaphors such as “dirty hands” or “clean records” may have a psychological basis such that people make sense of morality through physical cleanliness.

When people’s moral self image is threatened, as when they think about their own unethical past behaviors, people literally experience the need to engage in physical cleansing, as if the moral stain is literally physical dirt. We tested this idea in multiple studies and showed that when reminded of their past moral transgressions, people were more likely to think about cleansing-related words such as “wash” and “soap”, expressed stronger preference for cleansing products (for instance, a soap bar), and were also more likely to accept an antiseptic wipe as a free gift (rather than a pencil with equal value).

Further, physical cleansing may actually be effective in mentally getting rid of moral sins. In another study, in which participants who recalled unethical behaviors were either given a chance to cleanse their hands or not, we found that washing hands not only assuaged moral emotions such as guilt and regret but also reduced participants’ willingness to engage in prosocial behaviors such as volunteering Thus physical washing can actually wash away sins. Perhaps this effect is why most world religions practice some form of washing rituals to purify souls. We should be cautious, however, knowing that if our sins are so easily “washed away” we might not be as motivated to engage in actual compensatory behaviors to make up for our mistakes.

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At the time of Lewis and Clark, setting the prairies on fire was a well-known signal that meant, “Come down to the water.” It was an extravagant gesture, but we can’t do less. If the landscape reveals one certainty, it is that the extravagant gesture is the very stuff of creation. After one extravagant gesture of creation in the first place, the universe has continued to deal exclusively in extravagances, flinging intricacies and colossi down aeons of emptiness, heaping profusions on profligacies with ever-fresh vigor. The whole show has been on fire from the word go. I come down to the water to cool my eyes. But everywhere I look I see fire; that which isn’t flint is tinder, and the whole world sparks and flames.

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In the late ’60s and early ’70s, Jewish feminists claimed that the mikveh and other laws dealing with niddah, or menstruation, deemed women’s natural cycles unclean. (Under rabbinical law, married couples are forbidden to have sexual relations during the woman’s menstrual period and for seven days after menstruation has ceased. Some couples even sleep in separate beds during that time.) Objecting to what they saw as the patriarchal concept of ‘family purity,’ many feminists rejected the mikveh and the rituals that surround it. Mikveh continued, of course, but mostly among Conservative and Orthodox Jews.

‘Early feminists were very negative about the mikveh, seeing it as a denigration of women, a focus on ‘cleanliness’ and ‘impurity’ that seemed to be a way of keeping women from tainting men,’ says Shuly Rubin Schwartz, assistant professor of American Jewish history at Jewish Theological Seminary in New York City. ‘Now women are saying, ‘Wait a minute. This is a tradition that was an important part of Judaism for our foremothers. Let’s look at the deeper meaning.’’

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