How do you know that the spirits you see are truly there, and you are not hallucinating? This is no attack or criticism on your blog, but how do we know that psychic mediums are real and that spirits are real?
First, read this.
Second, you can’t prove the paranormal, especially with science. The whole point of the paranormal is that it can’t be proven. The only way you can really believe is if you met a genuine psychic medium, or have an encounter with a spirit yourself.