Translations:Benutzer:Arian/Klett-Mini-Test/379/en

How profoundly the human being carries within his head the mineral-dead that has fallen out of life is shown also by the appearance of brain sand, predominantly in the pineal gland (*epiphysis*). These are lemon-yellow little stones consisting of calcium and magnesium crystals. Rudolf Steiner observes on this: "Every human being must have a little brain sand within him" — but not as a permanent deposit; rather: "It must arise, the brain sand, and it must be dissolved again and again." This process of the formation of the crystals and their repeated dissolution Rudolf Steiner describes as the foundation of I-consciousness: "If we were unable to dissolve ourselves, we would not be able to think, we would not arrive at I-consciousness. In this dissolving consists what we call our I-consciousness." In the head, the activity of thinking fulfils itself.