The social and political convulsions that accompanied its dying now began to torture the vast frame of the Roman Empire, and even the Christians were caught up in the whirlpool of selfish warring interests. We still find scattered references to special knowledge imparted to the leaders and teachers of the Church, knowledge of the heavenly hierarchies, instructions given by angels, and so on. But the lack of suitable pupils caused the Mysteries to be withdrawn as an institution publicly known to exist, and teaching was given more and more secretly to those rarer and rarer souls, who by learning, purity, and devotion showed themselves capable of receiving it. No longer were schools to be found wherein the preliminary teachings were given, and with the disappearance of these the "door was shut." Two streams may nevertheless be tracked through Christendom, streams which had as their source the vanished Mysteries. One was the stream of mystic learning, flowing from the Wisdom, the Gnosis, imparted in the Mysteries; the other was the stream of mystic contemplation, equally part of the Gnosis, leading to the exstasy, to spiritual vision. This latter, however, divorced from knowledge, rarely attained the true exstasis, and tended either to run riot in the lower regions of the invisible worlds, or to lose itself amid a variegated crowd of subtle superphysical forms, visible as objective appearances to the inner vision--prematurely forced by fastings, vigils, and strained attention--but mostly born of the thoughts and emotions of the seer. Even when the forms observed were not externalised thoughts, they were seen through a distorting atmosphere of preconceived ideas and beliefs, and were thus rendered largely unreliable. None the less, some of the visions were verily of heavenly things, and Jesus truly appeared from time to time to His devoted lovers, and angels would sometimes brighten with their presence the cell of monk and nun, the solitude of rapt devotee and patient seeker after God. To deny the possibility of such experiences would be to strike at the very root of that "which has been most surely believed" in all religions, and is known to all Occultists--the intercommunication between Spirits veiled in flesh and those clad in subtler vestures, the touching of mind with mind across the barriers of matter, the unfolding of the Divinity in man, the sure knowledge of a life beyond the gates of death.