Last summer, Tim Lomas flew from London to Orlando to attend the fourth annual congress of the International Positive Psychology Association—held, naturally, at Walt Disney World. As Lomas wandered around the event, popping in and out of various sessions, he stumbled upon a presentation by Emilia Lahti, a doctoral student at Aalto University, in Helsinki. Lahti was giving a talk on sisu, a Finnish word for the psychological strength that allows a person to overcome extraordinary challenges. Sisu is similar to what an American might call perseverance, or the trendier concept of grit, but it has no real equivalent in English. It connotes both determination and bravery, a willingness to act even when the reward seems out of reach. Lomas had never heard the word before, and he listened with fascination as Lahti discussed it. “She suggested that this has been really valued and valorized by the Finns, and it was an important part of their culture,” he told me. At the same time, Lomas said, Lahti framed sisu as “a universal human capacity—it just so happened that the Finns had noticed it and coined a word for it.” The conference ended the next day, but Lomas kept thinking about sisu. There must be other expressions like it, he thought—words in foreign languages that described positive traits, feelings, experiences, and states of being that had no direct counterparts in English. Wouldn’t it be fascinating, he wondered, to gather all these in one place?
