In his
Enarrationes in Apocalypsin, Anselm of Laon, founder of the Glossa ordinaria (see Reply #164), gives an interesting interpretation of the voices of the seven thunders of Rev 10:3.
At the beginning of his comment on Chapter 10, Anselm sums up the last part of Chapter 9, the sounding of the 6th trumpet which is about the raging of Antichrist
in the Church:
Descripta persecutione quae erit tempore Antichristi in Ecclesia, ponit econtra auxilium quod imminet eis, scilicet Christum.
Having described the persecution which will happen during the time of Antichrist in the Church, he [John] puts in contrast the help which is imminent, which of course is Christ.
After the 6th trumpet of chapter 9, in chapter 10 John meets an Angel with a little book flipped open.
[1] And I saw another mighty angel come down from heaven [...]
[2] And he had in his hand a little book open [...]
[3] And he cried with a loud voice as when a lion roareth. And when he had cried, seven thunders uttered their voices.
[4] And when the seven thunders had uttered their voices, I was about to write: and I heard a voice from heaven saying to me: Seal up the things which the seven thunders have spoken; and write them not.
Anselm explains that the crying of the angel like the roaring of a lion refers to the preaching of the Church, while the voices of the seven thunders concern the time of Antichrist. He explains why John is asked to write not what the thunders spoke. The reason is not to conceal something from the faithful, but rather from the infidels. The reason is given in Mt 7:6
don't cast pearls before swine. The fact that John seals up the things that the thunders spoke and writes them not, signifies to us that in the time of Antichrist preaching will cease.
Hic per suam personam ubi scribere prohibetur, significat nobis quod tempore Antichristi praedicatio cessabit.
Patrologia Latina, mlat.uzh.chAnselm's interpretation of the sealing up of the things the seven thunders have spoken, to signify that preaching will cease, fits well with the teaching of the Vatican Council, that there will be shepherds and doctors
usque ad consummationem saeculi.