One needs to be aware that the evil powers should also be incorporated into earth development. When the time comes that we will have to overcome these forces again, human beings will have to exercise great strength to transform the evil and demonic into the good. However, his strength will thereby grow, because evil exists to strengthen the power of the human being through his victory over it. All evil must be melted down and transformed into the good again, and it is so placed by Providence to develop strong activity in humanity, much stronger than if he should never have had to transform evil into good.
Source (German): Rudolf Steiner – GA 101 – Mythen und Sagen, Okkulte Zeichen und Symbole – Cologne, December 28, 1907 (page 237-238)
Translated by Nesta Carsten-Krüger
Previously posted on 15 October 2018