If I Had Three Days of Light was a novel by Helen Keller. It told the story of how she lost her sight at a young age but finally regained it through hard work and perseverance. The novel was translated into many languages and was widely adapted into movies, television dramas, and stage plays. It became a classic literary work with far-reaching influence. It inspires people not to give up on believing in their own potential and ability to achieve their dreams through hard work and perseverance.