John will record the fulfillment of the mystery (and hence understanding of its content) when he relates what happens when the seventh angel blows his trumpet (Revelation 11:15). In short, at that point John will record the rage of the nations (Revelation 11:18) and the great Adversary behind the nations (Revelation 12:3–4, Revelation 12:13–17) and the appearance of beasts from sea and land (Revelation 13:1, Revelation 13:11).
7 but that in the days of the trumpet call to be sounded by the seventh angel, the mystery of God would be fulfilled, just as he announced to his servants the prophets.