Continuing my quote collecting, I have found the following.
If you talk to God, you are praying; If God talks to you, you have schizophrenia. If the dead talk to you, you are a spiritualist; If you talk to the dead, you are a schizophrenic.
Thomas Szasz (born April 15, 1920 in Budapest, Hungary) was a Professor Emeritus in Psychiatry at the State University of New York Health Science Center in Syracuse, New York. Szasz is a critic of the moral and scientific foundations of psychiatry.