Weyer, having been a student of medicine and having practiced as a physician, approached the subject with a rationalist perspective. He argued that many so-called witches and demonic possessions could be explained by natural causes, such as mental illness or the effects of certain drugs. His work was seen as controversial because it challenged the prevailing views on witchcraft and the supernatural, which were heavily influenced by the Church.
Weyer’s text lacks the elaborate Solomonic framework and the binding tools of later grimoires. It is more clinical and skeptical in tone. pseudomonarchia daemonum pdf