De Gradibus Ad Magnum Opus
This Great Work is the Attainment of the Knowledge and Conversation of thine Holy Guardian Angel. In the Eighth Aethyr
is the Way thereof revealed. But I say: prepare thyself most heartily and well for that Battle of Love by all means of Magick. Make thyself puissant, wise, radiant in every System, and balance thyself well in thine Universe. Then with a pure Will tempered in the thousand Furnaces of thy Trials, burn up thyself within thy Self. In the Preparation thou shalt have learnt how thou mayst still all Thoughts, and reach Ecstasy of Trance in many Modes. But in these Marriages thy conscious Self is Bridegroom, and the not-Self Bride, while in this Great Work thou givest up that conscious Self as Bride to thy true Self. This Operation is then radically alien from all others. And it is hard, because it is a total Reversal of the Current of the Will, and a Transmutation of its Formula and Nature. Here, o my Son, is the One Secret of Success in this Great Work: Invoke often.
 On the Steps to the Great Work