Reply #15: From a metaphysical perspective:

[Why Syzygy]

This is also why the Law of One series refused to use the term "psychic attack," and rather chose "negative greeting." To the enlightened mind, negative greetings are blessings because these entities can ONLY mirror to you what you've already created. The strength of their greeting can never EXCEED what you've created for yourself by your own free will.

Therefore, you're given a chance to balance out your karma and return to a place of perfect balance. People often plague themselves with guilt, believe that they've done something wrong and it will continue to haunt them. Thanks to the increasing intensity of 'thoughts becoming things' as we head towards the end of the cycle, most people's karmic balance is happening almost immediately after they create it… and the objective is not to judge you, but simply to restore you to a place of balance.

So, if you get a karmic blast, the best thing to do is RELEASE any sense of guilt or foreboding. Be grateful that you've cleared whatever it was you'd created, and strive to go the extra mile next time, trying to remain as pure and loving in your orientation as possible.
http://divinecosmos.com/index.php?option=com_content&task=view&id=317&Itemid=70

This reminds me of the old haunted movies, where in the end, the Evil entity one had so blithely used against others turns on the one who called, released and used it for their own nefarious purposes.