Revelation 22:1 says, “And he showed me a river of water of life, bright as crystal, proceeding out of the throne of God and of the Lamb in the middle of its street.” This river of life is the Spirit who gives life (2 Corinthians 3:6). The Spirit flows in the middle of the street of New Jerusalem.
Revelation 21:21b says, “And the street of the city was pure gold, like transparent glass.” New Jerusalem is spiritual. The street is not a physical street paved with gold. For many Bible expositors, gold symbolizes the divine nature. When we are walking on the street, that is, walking in (or according to) the divine nature, the Spirit flows. Conversely, when we are drinking the water of life, the Spirit, we are supplied to walk in the divine nature.
What does it mean to “walk in the divine nature”? Romans 6:4 says that we “walk in newness of life”, the divine life, and Romans 8:4 says we “do not walk according to the flesh but according to the spirit.” Galatians 5:16 and 25 exhort us to “walk by the Spirit.” Putting these verses together, to walk in the divine nature is to walk according to the Spirit of life who is in our human spirit (a prior post and the two following). This is in contrast to walking according to the flesh. The question is not what we are doing, nor whether we are doing good or bad. Romans 8 and Galatians 5 are not about right and wrong but about spirit versus flesh.
The Spirit is the river to supply us. Our walking on the street, our walking in the divine nature, is our cooperation with the Spirit and by the Spirit. Romans 8:13 tells us, “if you live according to the flesh, you must die [spiritually], but if by the Spirit you put to death the practices [habits, whether good or bad] of the body, you will live.” Romans 8:13b matches New Jerusalem; it is our walking on the street of gold to receive the river of life.