We have seen how the separate planets, the separate bodies of our cosmic system, arise from a common original substance, and have recognized that spiritual beings of various kinds are active in all this evolution. We have pointed out too in former lectures how spiritual science does not see merely physical material objects in the bodies of our cosmic system, but linked with the physical and material, spiritual beings of various grades. These may be beings of the most exalted order who raise evolution, thus benefiting the whole system, or they may be spiritual beings of a lower kind who hinder and destroy. Yet we must be clear that what seems to be hindrance and destruction is in the long run again membered into the wisdom of the whole system. One might therefore say: When something apparently destructive, retarding and evil exists anywhere, then evolution in its whole course will be so wisely guided that even this evil, this destruction and hindrance will be reversed and changed into the good.
Source: Rudolf Steiner – GA 102 – The Influence of Spiritual Beings on Man: Lecture IV– Berlin, 29th February 1908