Rosicrucianism(secret society):

The mysterious doctrine of the order is allegedly "built on esoteric truths of the ancient past", which "concealed from the average man, provide insight into nature, the physical universe, and the spiritual realm."[3] The manifestos do not elaborate extensively on the matter, but clearly combine references to Kabbalah, Hermeticism, alchemy, and mystical Christianity.[4]

https://en.m.wikipedia.org/wiki/Rosicrucianism