Sisu is a Finnish term that refers to a mixture of courage, resilience, grit, tenacity, and perseverance. It's a trait that has shaped not just the fate of a nation but continues to be a guiding principle for how Finns live their daily lives. Sisu: The Finnish Art of Courage offers a history of sisu as well as lessons on how anyone might cultivate a sense of sisu for themselves. Hardcover. Dimensions: 7" x 5.5".