in exploring buddhism, we often encounter the teaching to withdraw from worldly desires and attachments, reflecting on the predispositional tendencies that lead us away from inner peace. however, i've heard comments that some practices aim to recreate experiences deemed by many as transcendent, yet this information appears unobtainably hidden within texts not readily shared. could you elaborate on these secretive practices, especially those that despite their apparent harm or controversy, are pursued in the hope of achieving enlightenment?