Dostoevsky isn't simply saying we need optimism to survive—he's arguing that hope is the very mechanism by which we *remain alive* at all, not merely breathing. The distinction matters: a person can physically persist without hope, but their inner world shrivels into something he considers a kind of living death. When someone stops hoping—whether after repeated setbacks, grief, or chronic illness—they often describe the experience as a hollowing-out, a going-through-motions that feels less like living and more like existing as a shell. This explains why people in difficult circumstances sometimes recover when a single hope (a letter from a loved one, a new diagnosis, a chance at reunion) suddenly reignites what seemed extinct.