The emancipation of women is practically the greatest egoistic movement of the nineteenth century, and the most intense affirmation of the right of the self that history has yet seen.

Ellen Karolina Sofia Key (Swedish: [kej]; December 11 1849 – April 25 1926) was a Swedish difference feminist writer on many subjects in the fields of family life ethics and education and was an important figure in the Modern Breakthrough movement. She is best known for her book on education Barnets århundrade (1900) which was translated in English in 1909 as The Century of the Child.