De Arcano Subtilissimo
O my Son, there is that within thee of marvellous Puissance which is by its own Nature the Incarnation of thy Will, most ready to receive the Seal thereof. Therein lie hidden all Powers, all Memories, more than thou hast teen thousand fold! Learn then to draw from that great Treasure-House the Jewel of which thou art in any present Need. For all things that are possible to thy Nature are already hidden within thee; and thou hast but to name them, and to bring them back into the Light of thy Consciousness. Then squander not this Gold of thine, but put it to most fruitful Usury. Now then of the Art and Craft of this most Holy Mystery I write not, for a Reason that thou already knowest. Moreover, in this Matter, thou shalt best learn by thine own Experience, and thine Observation in true Science shall guide thee. For this Secret is still of Magick, and Occult, so that I know not certainly if thy Will lieth with my Way or no.
 On the Most Subtle Secret