6987. Who maketh man's mouth? That this signifies utterance, is evident from the signification of "mouth," as being the voice (of which above, n. 6985); and as it denotes the voice, it denotes utterance. What the "mouth" specifically signifies cannot be seen except from correspondence. The mouth together with the lips corresponds to the interior speech which is of the thought. The thought of man is active and passive; man has active thought when he speaks, and this may be called speaking thought; but his thought is passive when he does not speak; and the difference between the two can be seen by him who reflects. By the "mouth" of man is thus signified active or speaking thought, thus utterance.
[2] As regards active thought, which is signified by the "mouth," be it known that this thought also is speaking thought in its own way, and that by the activity of this speech it excites the organs of the body corresponding thereto. It appears as if the words of the speech were in the thought, but this is a fallacy; it is only the sense of the speech which is there, the nature of which man can scarcely know, for it is the speech of his spirit, which speech is universal speech, such as is the speech of spirits in the other life. When this speech flows into the correspondent organs of the body, it presents the speech of words, which is vastly different from the thought that produces it, as is very evident from the fact that a man can think in one minute what takes him a long space of time to speak or write; and this would not be the case if this thought were composed of words, as is the speech of the mouth. It is from the correspondence of the speech of the thought and the speech of the mouth, that when a man comes after death among spirits, he knows how to speak in the universal language, thus with spirits, no matter what had been their language in the world; and that he then scarcely knows otherwise than that he speaks there as in the world, when yet the words of their speech are not words such as man uses in the body, but are the ideas which had been of his thought, one idea containing very many things. For this reason spirits can utter in a moment what a man can scarcely utter in half an hour, and even then there are many things within the same idea which cannot possibly be expressed by bodily speech.
[3] Yet the angels in heaven speak in a different way from spirits; for the angels who are in heaven have their speech from intellectual ideas, which by the philosophers are called immaterial ideas; whereas spirits have their speech from ideas of the imagination, which are called material ideas; hence in one idea of the thought of the angels there are contained very many things which spirits cannot utter by many series of their ideas, besides many things which they cannot express at all. But when a spirit becomes an angel, he is in angelic speech, just as a man when after death he becomes a spirit, is in the speech of spirits, and for a similar reason. From all this it can be seen what active thought is, namely, that it is the speech of man's spirit.