Whilst the Book of Revelation does have a lot of strange imagery and symbolism, it also contains many concrete ideas that are foundational for our Christian lives today. The same truths we read about now would have encouraged the original readers/listeners (who were going through terrible persecution). We are on God's side in the battle between Good and Evil. God has won! No wonder there are so many great celebrations in heaven! In the light of this, let's actively worship and serve God together as that is how God created and equipped us.