The greatest, as the most puzzling mystery of the first type lies in the fact, that such re‐birth in a human body of the personal Ego of some particular Adept—when it has been dwelling in the Mâyâvi or the Kâma Rûpa, and remaining in the Kâma Loka—may happen even when his “Higher Principles” are in the state of Nirvâna.(651) Let it be understood that the above expressions are used for popular purposes, and therefore that what is written does not deal with this deep and mysterious question from the _highest_ plane, that of absolute spirituality, nor again from the highest philosophical point of view, comprehensible but to the very few. It must not be supposed that anything can go into Nirvâna which is not eternally there; but human intellect in conceiving the Absolute must put It as the highest term in an indefinite series. If this be borne in mind a great deal of misconception will be avoided. The content of this spiritual evolution is the material on various planes with which the Nirvânî was in contact prior to his attainment of Nirvâna. The plane on which this is true, being in the series of illusive planes, is undoubtedly not the highest. Those who search for that must go to the right source of study, the teachings of the _Upanishads_, and must go in the right spirit. Here we attempt only to indicate the direction in which the search is to be made, and in showing a few of the mysterious Occult possibilities we do not bring our readers actually to the goal. The ultimate truth can be communicated only from Guru to initiated pupil.