Tolstoy's great novel Anna Karenina follows the story of Russian aristocrat Anna who embarks on an affair with a dashing young officer. Murnighan and Kelly say that the lesson that Anna's story teaches is to think before jumping into an extramarital relationship even if it seems to you to be perfect and able to solve your problems. Think about the feelings you would hurt, say Murnighan and Kelly, and realize that your potential lover may not be on the same page as you, particularly if you think you're going to be with this person forever. It may seem exciting at the time – but that excitement can wear off.
