The speech of the celestial angels abounds in the vowels A (ah, as in father), and U (as u in rule). One may often determine from the Hebrew vowels in a passage which words belong to the class of celestials and which to the spirituals — i.e., whether they involve good or truth. The former use more frequently the sounds of O and U, for they have a full tone, and also occur oftener in the Third Heaven. (Heaven and Hell 241; True Christian Religion 278;, Spiritual Experiences 5112, 5620, 5787)

5112. About angelic speech

It is to be noted that when spiritual angels speak, their words, which are the mental images in their understanding, have an affinity with the vowels "e" and "i" and when they say "a" there is still something of an "e" that is, "ae" in it; and when they say "u" then there is something of "i" or "y" It is also to be noted that I was granted to know from this that when their speech falls into human speech, it falls into such words as have these vowels in them. But the words of heavenly angels have an affinity with "a", "o", "u", on account of which their speech falls into such words as have these vowels in them. For this reason when a person speaks with these angels, [the person's speech] is turned from words in which there are "e" and "i" to words in which there are "a", "o", "u". ¹

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