What does Revelation 10:11 mean?

John was told he must again prophesy about many peoples, nations, languages, and kings. He had digested the prophecy—in the form of the little scroll—and now he must communicate it. His prophecy would focus on the Gentiles and their treatment of Israel, and Israel's response to God's work on her behalf. He would prophesy about God's faithful two witnesses in Revelation 11; about Satan's vicious persecution of Israel in chapter 12; about Satan's two evil henchmen, the beast and the false prophet, in chapter 13; about the faithful 144,000 in chapter 14; about the assembling of armies at Armageddon in chapter 16; about the fall of Babylon in chapters 17 and 18; about Jesus' defeat of the nations in chapter 19; and about the consignment of unbelievers from all periods of history to the lake of fire in chapter 20.

The Roman Emperor had banished John to isolation on the island of Patmos, but he could not silence his witness. God would use John to write Revelation, the New Testament's book of prophecy, which millions have read.