How Can I Know That Any Particular Medium Is Trustworthy?

Most mediums are honest in their intentions, but none can ever claim to be infallible. Such a claim on their part would of itself be a positive proof of their lack of knowledge and honesty, and would prove them unworthy of confidence. The mistrust, by the public, of mediums and of mediumship, is the result largely of ignorance, or superstition on the part of some who have not learned to understand that messages from the Spirit world are natural and do not claim to be supernatural or infallible.