I feel errors in prophecy occur when, once again, mythos and logos collide and demand rectification.
I read tarot and engage in dream interpretation. These tools are, literally, considered Urim and Thummim.
(Don’t believe me? Look at this) http://en.wikipedia.org/wiki/Urim_and_Thummim
Keep in mind that Joseph’s was the one used by the Brother of Jarrod and not the same one used by Aaron and Moses. Each had, reportedly, different functions and abilities…
I am able to see the present and past quite clearly, but the future, especially in terms of time, is more mercurial and is completely dependant upon choice. Time means nothing in fourth dimensional (imaginable) reality. The readings are subject to the beliefs of the reader and his/her interaction with the one seeking advice. The quality of information received depends on the ability of the reader and the particular mindset at the time of the divination…sleep, alcohol, illness, mood all influence the outcome of the reading and the accuracy. Personal interpretation can be clouded. When my Thoth tarot says “something dark is brewing” it can really mean “someone is making coffee”. It’s pretty subjective and needs to be approached with a very open, educated mind and interpreted according to archetypal means. I think it is a mistake to assign meaning to ANY archetype without asking the seeker what the archetype means to them. The readings, and their subsequent interpretation, are incredibly intimate and very subjective. It is not advisable to apply, for example, a reading received for an individual to an entire group of individuals.
Here’s a vivid example. I did two readings last month. Both for struggling LDS members. One advised her to step away from the church and enjoy her own interpretation of personal spirituality. The other was advised to renew her faith in the LDS church, make amends with her religion and begin attending meetings. The information created peace and harmony in both and both report an improvement in the quality of life.