Edited sentence: According to the Bible, Jesus said that one should judge a prophet by his fruits, though it is not not clear whether this rule of the thumb also includes gurus.He further refers to Eileen Barker's list to recognize dangerous situation in religious movements.Some believe that this rule has the drawbacks that one should know what is good and bad in the first place and that one cannot possibly know all acts and their corresponding fruits of a guru.The history of various gurus, religions, sects, new religious movements and cults has shown that the question how to assess the authenticity of a guru is difficult, especially when the guru is still young