For centuries, the ancient Western Mysteries have been transmitted through rituals called "initiations." Everyone can learn from books how to perform rituals, visualization, and self-empowerment, but nobody can seriously initiate himself. To do so, you need one or more persons who will perform a special ritual for you. We know the existence of such ceremonies of initiations from a very early period, 1700 BCE if we consider the Mysteries of Eleusis in Greece. Later, other closed groups such as the Pythagorean, Neoplatonists, Hermetists, and Theurgists practiced initiatic secret rituals. My goal is not here to write an historical study, but it is worth noting that such initiatic societies have existed for a very long time, and are still present today in the world.
Anyone interested in Western Traditions has heard something about initiatic Orders, but they don't speak much about what they are and what goals they have. In my book, Rediscover the Magick of Gods and Goddesses, I follow the Hermetic and Theurgic