This world can be very daunting and discouraging for the believer. It can be fierce in its hostility and seductive in its duplicity. Either way, it can be difficult to resist. But John's vision of judgment tells us that evil does not have the last word. No matter how powerful and destructive it is, no matter how pervasive and successful it is, in the end sin will be overthrown. The kingdom of the world will not last (Rev 11:15). God will triumph. His kingdom will prevail.
From A Gospel Pageant: A Reader's Guide to the Book of Revelation by Allan Chapple, page 69.