91. Persons who are unfamiliar with Spiritism may be led to suspect the good faith of mediums; study and experience provide them, the means of assuring themselves of the authenticity of the phenomena. Additionally, the best guarantee lies in the medium's absolute disinterest and honorability. There are persons who, because of their position and character, are beyond any suspicion. If the possibility of material gain, can encourage fraud, common sense would indicate that where there is nothing to gain, charlatanism has nothing to do.