The universe in general is divided into two worlds, the spiritual and the natural. In the spiritual world are angels and spirits. In the natural world are men. These two worlds are entirely alike as to the external appearance, so alike that they cannot be distinguished; but as to internal appearance they are entirely unlike. The men themselves in the spiritual world, who, as said above, are called angels and spirits are spiritual. And because they are spiritual, they think spiritually and they speak spiritually. But men who are in the natural world are natural, and therefore they think naturally and speak naturally. And spiritual thought and speech have nothing in common with natural thought and speech. From this it is plain that these two worlds, the spiritual and the natural, are entirely distinct from each other, so that in no way can they be together.