Lecture XXII
Indeed, the dead feel most ill at ease of all when they enter the realm of the most pedantic concepts. These are the ones that have recently come to be defined in relation to the spiritual world for those people who do not want to live in anything spiritual, but who want the concepts for sense-perceptible things to apply to the spiritual world as well. These people conduct spiritualistic experiments in order to imprison spiritual concepts in the world perceptible to the senses. They are, in fact, more materialistic than any others. They seek rigid concepts in order to hold commerce with the dead. Thus they torture the dead most of all, for if they want to approach they force them to enter the very realm most disliked by them. The dead love mobile concepts, not rigid ones.
Cite:
GA 173c/1917-01-21/p041 · edition English