The right to access the tree of life and the right to enter the city, is obtained by continually washing our robes white in the blood of the Lamb, by continually betting our lives on the fact that Only God is Good, for He is our Yahweh Tsidkenu.
There are those who are not permitted access to the city, the dogs (those who bite and devour one another), the sorcerers (those who use drugs to connect to the other side), the immoral (those whose very existence is identified by sexuality), and those who practice the lie (those in the household of God who know the truth, but do not live the truth).
Jesus clarifies that the entire revelation was given for His bondservants and delivered to the churches. But His target audience is the bondservants, those who become His bride.