Revelation 22:3,4

And his servants shall serve him... — We turn from the city to the inhabitants. They are described as serving Him, seeing Him, and resembling Him. They shall serve Him: they shall offer Him the service of the priesthood — the word employed is that used of temple service. The word translated “servants” is the word which the Apostles used when they spoke of themselves as slaves of Jesus Christ, owned as well as employed by Him (Philippians 1:1; 2 Peter 2:1; Jude 1:1). Their service here was discharged in the midst of discouragements and in difficulty; and they walked by faith, not by sight. Now the servants shall serve without hindrance or opposition, and they shall be encouraged by His immediate presence. “They shall see his face;” they shall know even as they are known (1 Corinthians 13:12); they shall see Him as He is. No wonder, then, that he should add (and observe that the thought is exactly that which occurs in the First Epistle of St. John (1 John 3:2): “His name shall be in (or, on) their foreheads.” The name stands for what God is in holiness and righteousness, purity and love. The name on the forehead indicates their resemblance to their Master. On earth the servants of God are changed from glory to glory into the same image (2 Corinthians 3:18). They aim to be perfect, as their Father in heaven is perfect (Matthew 5:48); but when they see God as He is they shall be like Him. His name is on their foreheads, for they behold His face: they wake up after His likeness, and they are satisfied (Psalms 17:15). There is a divine paradox in the double truth: those who are like God see Him, and those who see Him are like Him (Matthew 5:8). “There will come a time when the service of God shall be the beholding of Him; and though in these stormy seas, where we are now driven up and down, His Spirit is dimly seen on the face of the waters, and we are left to cast anchors out of the stern and wish for the day, that day will come, when, with the evangelist on the crystal and stable sea, all the creatures of God shall be full of eyes within, and there shall be no more curse, but His servants shall serve Him, and shall see His face” (Ruskin).