Read Revelation 10.
Before that seventh trumpet sounded, John saw the vision described in this chapter. While the language in this chapter describes a visually stunning scene, very little of what John saw here is interpreted for us directly.
The “mighty angel” is another revelation of Christ. This interpretation is based on the description of his appearance in 10:1, the stance he took of one foot on land and the other on the sea, and the description of his voice in verse 3 as “a loud shout like the roar of a lion.”
After seeing and hearing him, John was commanded to take the scroll he came with and eat it (v. 9). This is a strange thing to do with a scroll but God was making a point with visuals here. As John ate the scroll, it tasted great (vv. 9-10) but was nauseating when digested (v. 10). The scroll, then, was God’s word but particularly God’s word of judgment. Once John digested its message, he learned that he “…must prophesy again about many peoples, nations, languages and kings” (v. 11). The taste of sweetness when John ate it visualized that it was God’s word; the sourness John felt as he digested it described how painful the message would be. Nevertheless, as a servant of the Lord, he must be obedient to what God commanded him to do.
None of us has the same level of responsibility for God’s truth as John did; each of us, however, is aware of the painful rebukes and promises of judgment God’s word has for unbelief and sin. Are you prepared to be faithful to what God’s word teaches, even if thinking about the consequences of disobedience make you sick?