Where do you start with this subject? By asking yourself questions.
Is it possible to hear the voices of those that have passed away? Is there any proof? Do you need proof or must you just accept that it happens? I'm a Christian and The Holy Bible forbids it. Why? Is it a confidence trick? Is it just entertainment? Does it help? Is it harmful?
As you read this page you should keep in mind that, I, the author of this page, does not believe that you, or anyone, can hear the words of your loved one that has left this earth. Of course, I may be wrong. I know that many folk do believe and it helps them through their life after their loss.
Is there any proof? Unfortunately not, and there have been many mediums that have been tested over the last 100 years in scientific tests, there is a 1 million dollar reward offered to anyone that can prove scientifically that hearing messages from someone that has died is possible. That reward still stands. Since the founding of the Society for Psychical Research in 1882 people have argued about this issue. http://www.spr.ac.uk/main/ for more information.
Do you need proof or must you just accept that it happens? You do need proof if you are a non believer, if you believe that it is possible you just accept it as a fact. That is where faith comes in, faith does not require proof.
The Holy Bible forbids it, Why? "Praying to the dead is strictly forbidden in the Bible. Deuteronomy 18:11 tells us that anyone who "consults with the dead" is "detestable to the Lord." The story of Saul consulting a medium to bring up the spirit of the dead Samuel resulted in his death "because he was unfaithful to the LORD; he did not keep the word of the LORD and even consulted a medium for guidance" (1 Samuel 28:1-25; 1 Chronicles 10:13-14). Clearly, God has declared that such things are not to be done." For more on this article go to, http://www.gotquestions.org/praying-to-the-dead.html
Does it help? Well, I know that it can help some that visit these psychics or listen to them. I have been told by them that they felt better and more able to accept the loss of their loved one. So, it did help them.
Does it do harm. It could where you to hear some information that was incorrect by being told that information by someone that you wished to believe in, but, if the psychic is a fake they will ensure that nothing like this happens to preserve their future. It may also harm your bank book.
Scientist Prof Richard Wiseman, University of Hertfordshire, says, "Mediums ( psychics ) are performing a stage show....relying on the fact that many in the audience are grieving..vulnerable...wanting to believe that their dead relative is speaking to them...they will search in their head to make the information fit. http://richardwiseman.wordpress.com/
Melinda Cooper, Medium, says, "...I don't ask any questions and I tape the reading so the client can listen back to it.....there are charlatans out there and it makes me angry because it gives us all a bad name. If you feel they are fishing or being vague, end the reading and ask for you money back".
Quote. "I shall not commit the fashionable stupidity of regarding everything I cannot explain as a fraud." - C.G.Jung. Carl Gustav Jung (German; 26 July 1875—6 June 1961) was a Swiss psychiatrist, an influential thinker and the founder of Analytical Psychology. Jung is considered the first modern psychiatrist to view the human psyche as "by nature religious" and make it the focus of exploration. See more at, http://en.wikipedia.org/wiki/Carl_Jung
So the question is not answered. It must be a personal thing.
( I hope that this post is fair to all concerned. I have attempted to give a fair representation of both points of view, for and against. I would be pleased for you to contact me if you disagree. )