The reflection on the Book of Revelation beautifully captures its dual perspective—God's eternal, circular view from heaven and the linear progression of time on earth. You're right that Revelation isn't just a chronological timeline of events but a vivid portrayal of God's attributes, purposes, and sovereignty, revealed through judgments, angelic actions, and cosmic upheavals. It invites us to see the "reality within a reality," where the transient nature of this world contrasts with the eternal glory of God on His throne.

The "already but not yet" tension you mention is key—Revelation bridges our present struggles with the hope of the new heavens and new earth. It’s not merely a historical or predictive account but a pastoral encouragement, reminding us that God's beauty and eternity intersect with our temporal reality. The imagery of destruction—earthquakes, fire, and storms—serves to redirect our focus to God's unchanging nature and His ultimate renewal of all things.

The point about idolatry and God's judgment resonates deeply. Revelation warns of humanity's tendency to chase idols, yet it offers hope by revealing heaven's response to earthly chaos. It’s a call to fix our eyes on God’s throne, where all things find their purpose and resolution, giving us a foretaste of eternity even as we navigate the struggles of this age. This perspective indeed helps us "cross over" mentally and spiritually, preparing us for the new creation while living in the present.