Plotinus taught that the One, being superessential, can only be apprehended in ecstasy, when thought, which still distinguishes itself from its object, is transcended, and knower and known become one. As Tennyson's Ancient Sage says: "If thou would'st hear the Nameless, and descend Into the Temple-cave of thine own self, There, brooding by the central altar, thou May'st haply learn the Nameless hath a voice, By which thou wilt abide, if thou be wise; For knowledge is the swallow on the lake, That sees and stirs the surface-shadow there But never yet hath dipt into the Abysm." In the same way Eckhart taught that no creature can apprehend the Godhead, and, therefore, that the spark in the centre of the soul (this doctrine, too, is found in Plotinus) must be verily divine. The logic of the theory is inexorable. If only like can know like, we cannot know God except by a faculty which is itself divine. The real question is whether God, as an object of knowledge and worship for finite beings, is the absolute Godhead, who transcends all distinctions. The mediaeval mystics held that this "flight of the alone to the alone," as Plotinus calls it, is possible to men, and that in it consists our highest blessedness. They were attracted towards this view by several influences. First, there was the tradition of Dionysius, to whom (e.g.) the author of the "Theologia Germanica" appeals as an authority for the possibility of "beholding the hidden things of God by utter abandonment of thyself, and of entering into union with Him who is above all existence, and all knowledge." Secondly, there was what a modern writer has called "the attraction of the Abyss," the longing which some persons feel very strongly to merge their individuality in a larger and better whole, to get rid not only of selfishness but of self for ever. "Leave nothing of myself in me," is Crashaw's prayer in his wonderful poem on St Teresa. Thirdly, we may mention the awe and respect long paid to ecstatic trances, the pathological nature of which was not understood. The blank trance was a real experience; and as it could be induced by a long course of ascetical exercises and fervid devotions, it was naturally regarded as the crowning reward of sanctity on earth. Nor would it be at all safe to reject the evidence, which is very copious,[19] that the "dreamy state" may issue in permanent spiritual gain. The methodical cultivation of it, which is at the bottom of most of the strange austerities of the ascetics, was not only (though it was partly) practised in the hope of enjoying those spiritual raptures which are described as being far more intense than any pleasures of sense[20]: it was the hope of stirring to its depths the subconscious mind and permeating the whole with the hidden energy of the divine Spirit that led to the desire for visions and trances. Lastly, I think we must give a place to the intellectual attraction of an uncompromising monistic theory of the universe.