Ellen Karolina Sofia Key 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 was an early advocate of a child-centered approach to education and parenting, and was also a suffragist.
She is best known for her book on education, Barnets århundrade, which was translated in English in 1909 as The Century of the Child.
A great poet has seldom sung of lawfully wedded happiness, but of free and secret love; and in this respect, too the time is coming when there will no longer be one standard of morality for poetry and another for life. To anyone tender of conscience, the ties formed by a free connection are stronger than the legal ones.