The strange effects of certain herbs or minerals, anomalies in the sky or the stars, the practice of necromancy or geomancy, even the existence of magic itself – all these are evidence of aspects of the world that refuse to reveal themselves, that remain hidden or occulted. As Agrippa notes, “they are called occult qualities, because their causes lie hid, and man’s intellect cannot in any way reach, and find them out.”
