Lecture I

If I may now be allowed to make a personal reference, it is this: Conceptions of the reality of the spiritual world presented no difficulty to me at any age. What the spiritual world revealed penetrated into my soul, formed itself into ideas, into thoughts. On the other hand, things that came easily to others were difficult for me. I was always able quickly to grasp the arguments of natural scientific thinking, but concrete facts would not remain in my memory, simply would not register there. I could without effort understand the wave-theory, the arguments of the mathematicians, physicists and chemists; on the other hand, unlike most others, I could not recognise a particular mineral if I had seen it only once or twice; I was obliged to look at it perhaps thirty or forty times before I could recognise it again. I found it difficult to retain concrete pictures of the things of the external, material world. It was not easy for me to come fully into the physical world of sense.