Answer:

“Have the seven thunders which equals seven mysteries already been revealed? Were they revealed in the seven Seals, but are yet--but are yet not known to us as the thunders yet? No, they were revealed in the seven Seals; that's what the thunders was about. They was to reveal... The seven thunders that had uttered their voices and no one could make out what it was... John knew what it was, but he was forbidden to write it. He said, "But the seventh angel, in the days of his sounding, the seven mysteries of the seven thunders would be revealed." And the seventh angel is a messenger of the seventh church age. See?” [Questions And Answers 4 Jeff. IN COD 64-0830E]

(Answers provided by Brother Donny Reagan, Pastor, Happy Valley Church , TN, USA)