Lecture III
In short, when we begin to think about the reality we come to the dissolution of what is commonly called the physical world. For this physical world derives its existence from the spirits of the higher hierarchies pushing in their intermingled thoughts, and I beg you to imagine that finely distributed quantities of water are introduced in some way which form a thick mist. That is why your body appears as a kind of shadow-form, because the thoughts of the spirits of form penetrate those of the spirits of wisdom, the formative thoughts enter the thoughts of substance. In face of this conception the whole world dissolve into the spiritual. We must, however, have the possibility of imagining the world to be really spiritual, of knowing that it is only apparent that my arms and hands, my feet and legs are given over to the earth. That is what it seems; in reality the metamorphosis of my arms and legs, hands and feet begins there and comes to completion in the life between death and a new birth, when my arms and legs, hands and feet become the head of my next incarnation.