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)

236. All people in heaven have the same language. They all understand each other, no matter what community they come from, whether nearby or remote. This language is not learned but is innate; it flows from their very affection and thought. The sound of the language corresponds to their affection and the articulations of the sound — the words, that is — correspond to the mental constructs that arise from their affections. Since their language corresponds to these [inner events], it too is spiritual, for it is audible affection and vocal thinking.

[2] Anyone who reflects may realize that all thought comes from affection, which is a function of love, and that mental constructs are various forms into which the general affection is apportioned; for no thoughts or concepts whatever occur apart from affection. This is the source of their soul and life. This is why angels know simply from speech what kind of person someone is — they know the quality of the affection from the sound and the quality of the mind from the articulations of the sound, or words. Wiser angels know from a single series of statements what someone's ruling affection is, since this is what they are primarily attentive to.

[3] It is recognized that all people have various affections or moods — one in times of happiness, another in times of sorrow, another in times of tenderness and compassion, another in times of honesty and truth, another in times of love and thoughtfulness, another in times of zeal or anger, another in times of pretense and guile, another in times of ambition for respect and adulation, and so on; but there is a dominant affection or love within all of these, so since the wiser angels perceive this, they know from conversation the whole state of another person.

[4] I have been granted knowledge of this through an abundance of experience. I have heard angels discover a person's life simply by listening. They have told me that they know everything about another person's life from a few individual ideas because these enable them to know the person's ruling love, which contains everything in a pattern. This is all that our "book of life" is.