Most Wiccans subscribe to the Law of Three. This is
the basic idea, that whatever you do, be it good or bad,
comes back to you thrice. Nearly all Earth based religions
hold some form of the Law of Return. This law protects us
from harm by our own doing, or from others, because it
prevents a true witch from using the power unwisely, or for
ill intentions.
Just
for grins, I'd like to explain my theory on why the Rule of
Three is true.
We are
all aware of all the hub-bub about perpetual motion, and
momentum. It is my belief that the Law of Three operates on
these very basic scientific principles (most magickal
workings do operate on some scientific principle!)
When
something is set in motion, it will continue in the same
direction, until something (an immovable force) stops, or
redirects it. Energy, because it is not solid, will not stop
for an immovable force (the subject of your spell), it will
simply redirect itself, back to it's point of origin, (you)
(reflection). Generally, when something is forced to change
directions, it gains momentum and becomes more powerful.
Also, if something is set into motion, it will gain momentum
as long as there is no friction encountered. Again, as Energy
is not solid, it can not encounter friction, therefore, it
gains momentum the entire time it is moving.