I’m glad you are interested in Optimism: An Essay by Helen Keller. This is a short book that was published in 1903 by the famous American author, activist, and educator who was blind and deaf since childhood. In this book, Keller shares her personal philosophy of optimism and how it helped her overcome her challenges and achieve her goals. She also discusses the sources, benefits, and practice of optimism in various aspects of life, such as religion, science, literature, and social issues.