SisuDiscover the Finnish quality of sisu and how cultivating it can help you lead a life of greater purpose and happiness. This ancient Finnish word describes an attitude of courage, resilience, grit, tenacity, and perseverance. This key psychological competence enables extraordinary action in times of adversity. To have sisu confers a further dimension of doing so with honesty, integrity, and humility. By cultivating sisu you can: Face life's challenges