A most important event took place — it can only be described from the facts that are confirmed as truths in the spiritual world — a very important event occurred at the end of the seventies of the nineteenth century. […] a time is beginning when beings who are not human are coming down to earth from cosmic regions beyond. These beings are not human but depend for the further development of their existence on coming to earth and on entering here into relationships with men.
Thus, since the eighties of the nineteenth century, heavenly beings are seeking to enter this earth existence. […] Heavenly beings are already here in our earth existence. And it is thanks to the fact that beings from beyond the earth are bringing messages down into this earthly existence that it is possible at all to have a comprehensive spiritual science today.
Taken as a whole, however, how does the human race behave? If I may say so, the human race behaves in a cosmically rude way toward the beings who are appearing from the cosmos on earth, albeit, to begin with, only slowly. Humanity takes no notice of them, ignores them. It is this that will lead the earth into increasingly tragic conditions. For in the course of the next few centuries, more and more spirit beings will move among us whose language we ought to understand. We shall understand it only if we seek to comprehend what comes from them, namely, the contents of spiritual science. This is what they wish to bestow on us. They want us to act according to spiritual science; they want this spiritual science to be translated into social action and the conduct of earthly life.
Source: Rudolf Steiner – GA 204 – Materialism and the Task of Anthroposophy: Lecture XIV – Dornach, May 13, 1921
Translated by Maria St. Goar