Demon
Occultism

In occultism, demons are often seen as beneficial and useful, lacking an inherent negative connotation. While some people fear demons, or attempt to exorcise them, others willfully attempt to summon them for knowledge, assistance, or power. William of Conches (c. 1090/1091 – c. 1155/1170s) understands 'demon' closer to the Greek 'daimon', reserving the concept of the "devil" only for the "demons of the lower regions":

You think, as I infer from your words, that a demon is the same as a devil, which is not the case. For a demon is said to be any invisible being using reason, as if knowing. Of these the two high orders are called calodemons, that is, 'good knowing ones', the lower order is called cacodemon, that is, 'evil knowing one', for calos means 'good', cacos 'bad'.

The ceremonial magician usually consults a grimoire, which gives the names and abilities of demons as well as detailed instructions for conjuring and controlling them. Grimoires are not limited to demons – some give instructions for the invocation of deity, a process called theurgy. The use of ceremonial magic to call demons is also known as goetia, a word derived from the Greek word " goes ", which originally denoted diviners, magicians, healers, and seers.
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