O my Son, in this Letter have I written the Name of my own Nature, its Law, its Quality, its Will and its Appurtenance or Ornament. For it is the Child of my Love toward thee, and the Expression through mine Art of my Will so far as that regardeth thee. Now every Child is made of the Essence of his Father, so that every Creation is a Likeness or image of the Creator, but modified by the Mother, that is to say, the Material whereon he begetteth it. So then this Letter is a Projection of mine own Star in a Mirror, to wit, mine Idea in thy Regard; and it shall be unto thee as a clear Vision of thy Father, and of the Word of the Æon that he hath uttered unto Man. But also, because this Word is the Formula of the Æon, that is the Law of its Changes or Phenomena, the Equation that expresseth its Energy and its Motion, it shall serve every Man in his Measure as a Text-Book or Comment upon the Theorick and Praxis of Magick. By it may he discover his true Nature, and its Will, and apply his Force and his Intelligence to the right Fulfilment thereof. It shall be a beacon to enlighten him, to comfort him, and to direct him; and it shall be a Witness and Memorial of my Word and of my Work, as of mine Attainment unto Wisdom.