" The description of the New Jerusalem in chapters 21 and 22 is quite clear that some categories of people are “outside”: the dogs, the fornicators, those who speak and make lies. But then, just when we have in our minds a picture of two nice, tidy categories, the insiders and the outsiders, we find that the river of the water of life flows out of the city; that growing on either bank is the tree of life, not a single tree but a great many; and that “the leaves of the tree are for the healing of the nations.” There is a great mystery here, and all our speaking about God’s eventual future must make room for it. This is not at all to cast doubt on the reality of final judgment for those who have resolutely worshipped and served the idols that dehumanize us and deface God’s world. It is to say that God is always the God of surprises. But "

― N.T. Wright , Surprised by Hope: Rethinking Heaven, the Resurrection, and the Mission of the Church