For instance, Swedenborg's description of the inhabitants of Mercury and their love of abstract knowledge contains an instructive lesson. 'The spirits of Mercury imagine,' he says, 'that they know so much, that it is almost impossible to know more. But it has been told them by the spirits of our earth, that they do not know many things, but few, and that the things which they know not are comparatively infinite, and in relation to those they do know are as the waters of the largest ocean to those of the smallest fountain; and further, that the first advance to wisdom is to know, acknowledge, and perceive that what we do know, compared with what we do not know, is so little as hardly to amount to anything.'[27] So far we may suppose that Swedenborg presents his own ideas, seeing that he is describing what has been told the Mercurial spirits by the spirits of our earth, of whom (during these spiritual conversations) he was one. But he proceeds to describe how angels were allowed to converse with the Mercurial spirits in order to convince them of their error. 'I saw another angel,' says he, after describing one such conversation, 'conversing with them; he appeared at some altitude to the right; he was from our earth, and he enumerated very many things of which they were ignorant.... As they had been proud on account of their knowledges, on hearing this they began to humble themselves. Their humiliation was represented by the sinking of the company which they formed, for that company then appeared as a volume or roll, ... as if hollowed in the middle and raised at the sides.... They were told what that signified, that is, what they thought in their humiliation, and that those who appeared elevated at the sides were not as yet in any humiliation. Then I saw that the volume was separated, and that those who were not in humiliation were remanded back towards their earth, the rest remaining.'