The symbol of the crystal signifies the unalterable law of events that comes of itself In this seed you grasp what is to come. I saw something terrible and incomprehensible. (It was on the night of Christmas day of the year 1913.)
I saw the peasant’s boot, the sign of the horrors of the peasant war, of murdering incendiaries and of bloody cruelty: I knew to interpret
this sign for myself as nothing but the fact that something bloody and dreadful lay before us. I saw the foot of a giant that crushed a whole city: How could I interpret this sign otherwise?
I saw that the way to self-sacrifice began here. They will all become terribly enraptured by these tremendous experiences, and in their blindness will want to understand them as outer events. It is an inner happening; that is the way to the perfection of the mystery of Christ, so that the peoples learn self-sacrifice. ~Carl Jung, Red Book, Page 254