How can one enter the New Jerusalem?

Entry into the New Jerusalem is a matter of divine election and grace, as emphasized in Revelation 21:27, which states that nothing impure will enter the city, but only those whose names are written in the Lamb's Book of Life. This highlights the Reformed doctrine of election, where God sovereignly chooses whom He will save. The phrase 'written in the Lamb's Book of Life' signifies that those elected by God are redeemed through faith in Christ, who is the source of righteousness. Thus, access to the New Jerusalem is not based on human merit or righteousness but solely upon Christ's atoning work and God's sovereign grace. This assures believers that their place in this glorious city does not hinge on their efforts but on the unchangeable decree of God.