All the religions of the past have used this, but they have only given the outcome to the world without making its mystery known. It has been a cult in every religion. The great mystics who understood it did not impart this knowledge to the masses. It would not be wise to give a loaded revolver to a person who might lose his temper in a moment of time. One needs to be sure that he has such control that he will only use it in the best way. So it has been with the mystics. They do not give initiation until they know that they can trust a person that he will make the best use of it.