In March 1918 he wrote to Lang, who had sent him some of his own fantasies: as you have observed correctly yourself, it is very important to experience the contents of the unconscious before forming any opinions about it.
I very much agree with you that we have to grapple with the knowledge content of Gnosticism and neo-Platonism.
These are the systems that contain the materials which are destined to become the foundation of a theory of the unconscious.
I’ve been working on this myself for quite some time, and also have had ample opportunity to compare my experiences at least partially with those of other people.
That’s why I was very pleased to hear pretty much the same opinions from you.
I am glad that all on your own you have discovered this area of work waiting to be tackled.
Up to now, I lacked any co-workers, and I am happy that you want to join forces with me.
I consider it very important that you extricate your own material in an unbiased way from the unconscious, as carefully as possible.
My own material is very voluminous, very complicated, and in part I’ve worked it through up to almost complete, very vivid clarifications.
But what’s completely missing, is modern material to compare it with. Zarathustra has been formed too consciously.
Meyrink retouches the material in an aesthetic way; furthermore, I feel he is lacking in religious sincerity. ~The Black Books, Vol. I, Page 67