ARCANE • DICCIONARIO INGLES.COM • Definition of Arcane

... 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 ...

— Esoteric Christianity, or The Lesser Mysteries • Annie Besant