"One should stimulate that sleeping serpent by grasping its tail. Then that shakti , awakening from her torpor, will be forced to rise upwards. It should be done with the paridhana technique and, by inhaling through the solar channel, one will have its awakening every day for ninety minutes, morning and evening."
January 1, 1970
https://en.wikiquote.org/wiki/Ha%E1%B9%ADhayoga_Prad%C4%ABpik%C4%81