“The Magician’s Companion: A Practical & Encyclopedic Guide to Magical & Religious
Bill Whitcomb, 1997
VII. Law of Unity
Everything (through all space and time) is linked, either directly or indirectly, to everything else. (See Law of Contagion within IX. Law of Association.)
This is being proven through quantum physics. One of the basic ideas in quantum physics is entanglement. It is a form of link between objects that come into contact with each other. Traits carry over from one to the other. If something is done to the one it is then done to the other. This is in part sympathetic magic.