Three-Fold Law
The Three Fold Law is the cornerstone principle that lies at the heart of WIccan religion and spirtuality. In modern Wicca this law is said to return energy "three times" the level at which it was sent out. In other words, if a Wiccan casts a spell then the energy return three-fold to the spellcaster. Curiously there is no couterpart to this principle in Nature or metaphysics.
Under the mundane laws of physics, if an object is tossed upward it will naturally descend at the same rate of speed at which it climbed. This is because the force of gravity exerted onthe object is equal during both the ascent and descent.
Another way of understanding the Three-Fold Law, in a manner more consistent with the ways of Nature, is to picture it as a "cause and effect" relationship.
For example, if you help someone in distress you will typically feel good about yourself as a person. This will influence your thoughts. In other words, your state of consciousness has been altered. This affects the way you feel because emotions cause glandular secretions to enter into your blood system.
The resulting state of the mind and body will affect your spirit. This you have been affected on three levels by one single deed. Your mind, body, and spirit have responded to energy, a three-fold return in a cause and effect relationship.