A teacher, guru.... is very beneficial to some extent. I often meet people who have reached mastery in their lives and let them preach to me as to how they got there. Or get inspired by some souls who live by exemple.
However this whole I put my life, my soul, my energy, my heart in the hands of a mortal being who is supposed to be perfect results in what we have seen with all the abusive teache
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"Cults," Sects, and "New Religious Movements"