There are also symbolic displays, as well as branchings off of the displays into any other matter, or subject, that cannot possibly be described because they cannot be conceived of by the earthly mind. And when I thought of describing them in words-such as the things that happened to me last night, they were beyond my grasp. Yet at the time when they occur, they are so meaningful and striking, that one would think them just as understandable and expressible as earthly ones. But as soon as the mind awakens and concentrates upon them, one does not know at all what they were like, nor what they were. This kind of displays occurs mainly in sleep, as well as just when one is waking up-at a time when the material imagery of objects of the senses are far removed from the mental processes. 1748, 29 February.