The book ‘The Life of Reason’ is written by George Santayana. ‘The Life of Reason: The Phases of Human Progress’ is a philosophical work it was published in five volumes from 1905 to 1906. The volumes contained in this book are ‘Reason in Common Sense’, ‘Reason in Society’, ‘Reason in Religion’, ‘Reason in Art’ and ‘Reason in Science’.