From Revelation ch 20 "They came to life and reigned with Christ for a thousand years. The rest of the dead did not come to life until the thousand years were ended. This is the first resurrection. Blessed and holy is he who takes part in the first resurrection. Over these the second death has no power, but they shall be priests of God and of Christ and shall reign with Him a thousand years." There is death coming to most of us soon but a second death we would hope in Christ to survive (especially by being in the first resurrection) - because the second death is the future Lake of Fire. The city that comes when the second death comes as alternative to it will be the reason we purify ourselves right now. No false or idolatrous people ever will enter it. If we want to ready ourselves to enter it we cleanse ourselves by putting false practices and idolatry away from our behaviour. We focus on honesty and true worship and throw off the alternatives to truth as evil and like Satan's own ways. We repent as we see that city being a reality of the future, as events clarify and confirm prophecy.
