Book excerpt: In this New York Times bestseller, Isaac Lidsky draws on his experience of achieving immense success, joy, and fulfillment while losing his sight to a blinding disease to show us that it isn’t external circumstances, but how we perceive and respond to them, that governs our reality. Fear has a tendency to give us tunnel vision—we fill the unknown with our worst imaginings and cling to what’s familiar. But when confronted with new challenges, we need to think more broadly and adapt. When Isaac Lidsky learned that he was beginning to go blind at age thirteen, eventually losing his sight entirely by the time he was twenty-five, he initially thought that blindness would mean an end to his early success and his hopes for the future. Paradoxically, losing his sight gave him the vision to take responsibility for his reality and thrive. Lidsky graduated from Harvard College at age nineteen, served as a Supreme Court law clerk, fathered four children, and turned a failing construction subcontractor into a highly profitable business. Whether we’re blind or not, our vision is limited by our past experiences, biases, and emotions. Lidsky shows us how we can overcome paralyzing fears, avoid falling prey to our own assumptions and faulty leaps of logic, silence our inner critic, harness our strength, and live with open hearts and minds. In sharing his hard-won insights, Lidsky shows us how we too can confront life's trials with initiative, humor, and grace.