New Defender's Study Bible Notes
9:7 increase. Reigning eternally, Christ and His glorified saints will continue to extend His domain, by exploration, development, and utilization, throughout His infinite creation—forever. See notes on Revelation 22:3.
9:7 throne of David. Although His kingdom will be of unlimited extent, its center will be in the New Jerusalem, on the throne of David, as promised to Mary before He was born (note Luke 1:32,33; also see Ezekiel 37:25).
9:7 zeal of the LORD. This magnificent kingdom can never be achieved by human effort, but only by the “zeal of the LORD of hosts.”