1639. The speech of words, as has been said, is the speech proper to man, and in fact to his corporeal memory; but the speech of ideas of thought is the speech of spirits, and in fact of the interior memory, which is the memory of the spirit. Men are not aware that they have this memory, because the memory of particulars, or of material things, which is corporeal, is everything, and obscures the interior memory; when yet without the interior memory, which is proper to his spirit, man cannot think at all. From this memory I have often spoken with spirits, thus in their own language, that is, by ideas of thought. How universal and copious this language is, may be seen from the fact that every word contains an idea of great extension; for it is well known that the single idea of a word may be set forth by many words; and this is still more true of the idea of one whole subject, and still more so of the idea of a number of such subjects, which can be brought together into one compound idea that still appears as simple; from which may be seen what is the quality of the natural speech of spirits among themselves, and by means of which speech man is conjoined with spirits.