John hears heaven’s reaction to the judicial acts of God in the earth. The angels delight to see God reward sin and not leave it unpunished.
Some deny God’s right to judge. They insist that he should only show mercy towards sinners; that there should never come a time when his patience is exhausted. But the angels praise God for his judgments. His judgments define what is righteous. He has given men ample opportunity to repent and they have persisted in their hardness of heart. When at last his punishments come, they are fair and proportional, but they are proportional to his understanding of what sin is and not to a distorted human under-evaluation of sin. None will be able to accuse God of injustice when, in that great day, he banishes them to hell for ever.