It (occult forces) is a long and complex subject. The Mother and Sri Aurobindo have written much about it and there are also a few talks of mine on Auromaa related to this, such as,
Sanatana Dharma 17: Occultism and Spirituality
Website Link: https://auromaa.org/sanatana-dharma-17-occultism-and-spirituality/
YT Link: https://youtu.be/nx31fY2kmjI
Basically, there is a complex web of forces behind the visible, tangible phenomenal world. The interplay of these forces is the hidden cause of the outer events. Studying and mastering them is a step towards mastery and control over life, over events and circumstances, including health and illness.
Affectionately,
Alok Da
