Hermeticism has many phillosophies, I enjoy Prisca Theologia; it states that a single true theology exists, but within all religions. If you truly study religion you will notice that they are the same.
The saying " As above, so below" originates from the Hermetic philosophy. It's commonly interpereted in two seperate ways, one being that anything that happens on a level of reality, those levels above and below are affected equally. The other one being that it is an expression of the Macrocosm and Microcosm.
You may visit this website for more information: https://en.wikipedia.org/wiki/Hermeticism#Philosophy
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