New Jerusalem is the eternal Holy of Holies, as seen in its equal dimensions, “the length and the breadth and the height of it are equal” (Revelation 21:16). Within this Holy of Holies is “the throne of God and of the Lamb” (22:1).
Although New Jerusalem is not yet here, we can have a foretaste (e.g. firstfruits in Romans 8:23). We should not wait passively; we should come forward to the present spiritual reality of New Jerusalem. Because Christ is our great High Priest, Hebrews 4:16 encourages us, “Let us come forward with boldness to the throne of grace that we may receive mercy and find grace for timely help.” This throne is the same as the throne in New Jerusalem. Footnote 1* on “throne of grace” tells us:
Undoubtedly, the throne mentioned here is the throne of God, which is in heaven (Rev. 4:2). The throne of God is the throne of authority toward all the universe (Dan. 7:9; Rev. 5:1). But toward us, the believers, it becomes the throne of grace, signified by the propitiation place (the mercy seat) within the Holy of Holies (Exo. 25:17, 21). This throne is the throne of both God and the Lamb (Rev. 22:1). How can we come to the throne of God and the Lamb, Christ, in heaven while we still live on earth? The secret is our spirit, referred to in v. 12. The very Christ who is sitting on the throne in heaven (Rom. 8:34) is also now in us (Rom. 8:10), that is, in our spirit (2 Tim. 4:22), where the habitation of God is (Eph. 2:22). At Bethel, the house of God, the habitation of God, which is the gate of heaven, Christ is the ladder that joins earth to heaven and brings heaven to earth (Gen. 28:12-17; John 1:51). Since today our spirit is the place of God’s habitation, it is now the gate of heaven, where Christ is the ladder that joins us, the people on earth, to heaven, and brings heaven to us. Hence, whenever we turn to our spirit, we enter through the gate of heaven and touch the throne of grace in heaven through Christ as the heavenly ladder.