If true knowledge, the Gnosis, is again to form a part of Christian teachings, it can only be under the old restrictions, and the idea of levelling down to the capacities of the least developed must be definitely surrendered. Only by teaching above the grasp of the little evolved can the way be opened up for a restoration of arcane knowledge, and the study of the Lesser Mysteries must precede that of the Greater. The Greater will never be published through the printing-press; they can only be given by Teacher to pupil, "from mouth to ear." But the Lesser Mysteries, the partial unveiling of deep truths, can even now be restored, and such a volume as the present is intended to outline these, and to show the nature of the teachings which have to be mastered. Where only hints are given, quiet meditation on the truths hinted at will cause their outlines to become visible, and the clearer light obtained by continued meditation will gradually show them more fully. For meditation quiets the lower mind, ever engaged in thinking about external objects, and when the lower mind is tranquil then only can it be illuminated by the Spirit. Knowledge of spiritual truths must be thus obtained, from within and not from without, from the divine Spirit whose temple we are 4 and not from an external Teacher. These things are "spiritually discerned" by that divine indwelling Spirit, that "mind of Christ," whereof speaks the Great Apostle, 5 and that inner light is shed upon the lower mind.