That was supposedly the credo of the three...maiden, woman, and crone. It is part of the rule of three times three.
My son became a Wiccan VERY briefly when he was a teenager, and I was so freaked out I researched it VERY thoroughly. I read all the books by Scott Cunningham. Supposedly the THREE forms of the Goddess bring blessings or harm right back onto the Wiccan practitioner. In other words, if you do good works, the good supposedly returns to you multiplied by nine. If you do harm to anyone, or perform spells of ill wishing, that will also boomerang right back onto you nine times.
I think that if a person is messing around with things they don't fully understand, that the "harm" they bring might be to themselves.
