The Finnish word Sisu is often translated as resilience, grit, or perseverance, but none of those words fully capture its meaning. As Dr. Elisabet Lahti explains in this conversation, Sisu is the hidden reserve of strength that appears precisely when we believe we have nothing left to give. It is the mysterious “second wind” that enables us to endure great hardship while remaining connected to something deeper than mere willpower. Although rooted in Finnish culture and history, Sisu points toward a universal human capacity that exists within all of us.








