[2] As regards active thought, meant by 'mouth', it should be recognized that such thought is also in its own kind of way a form of speaking, and that through the activity of this speech it activates the physical organs that correspond to it. Verbal expressions are seemingly present in thought, but that is an illusion; solely the meaning embodied in speech is present there. Man can have scarcely any idea of the nature of such meaning, for it is the speech that his spirit possesses, which is a universal kind of speech such as spirits in the next life employ. When this kind of speech passes into corresponding physical organs it gives rise to speech consisting of words, which is exceedingly different from the thought that produces it. That very great difference is plainly evident from the consideration that a person is able to envisage in a minute what will take him a long time to speak or write about. It would be different if that thought consisted of words such as speech in the mouth consists of. By virtue of the correspondence between speech intrinsically within thought and speech uttered by the mouth a person knows how to talk in the universal language as soon as he comes after death among spirits, and so can talk to any spirits, no matter what language they may have spoken in the world; and by the same virtue, as he talks to them there he is scarcely aware that he is not talking the same way he did in the world. Yet the words of which their speech consists are not words such as a person employs when he is in the body. Rather they are the ideas that have composed his thought, and one idea contains very much detail within it. Spirits are therefore able to declare in an instant what man can scarcely express in half an hour; and there is still more contained in the same idea, such as cannot find expression in physical speech.

[3] Yet angels in heaven speak in a different way from spirits. Angels in heaven possess speech consisting of intellectual concepts, which are called immaterial ideas by philosophers, whereas spirits possess speech consisting of mental pictures, which are called material ideas. Consequently one idea belonging to angels' thought contains very much that spirits cannot fully describe even with very many lines of thought, in addition to much that they cannot begin to express. But when a spirit becomes an angel he uses angelic speech, just as a person uses spirits' speech when he becomes a spirit after death, and for a similar reason. From all this one may now see what active thought is - that it is the speech a person's spirit possesses.