John's journey through heaven is like a journey through the tabernacle... at the far end, in the Holy of Holies, only a priest with a perfectly clean garment was allowed inside. In Revelation, the blood of Jesus has cleansed us so thoroughly that the saints may now stand directly before God, in His presence, with nothing between us and Him! Later in Revelation, the slain saints will ride with Him into battle, slaying evil and establishing the millennial kingdom.
