From what is now happening (World War I), a few souls must come to a realization that we cannot go on like this; human evolution must take up the spiritual! Materialism is confronting its karma in this, the most terrible of all wars. In a certain sense, this war is the karma of materialism. The more this fact is realized by human beings, the more they will abandon their arguments about who is to blame for the war, and then they will have to realize that this war has been sent into world history to admonish man to turn to a spiritual perception of human life in its entirety.
Source: Rudolf Steiner – GA 159 – Christ in Relation to Lucifer and Ahriman -Linz, May 18, 1915