Revelation 1:7

with clouds--Greek, "the clouds," namely, of heaven. "A cloud received Him out of their sight" at His ascension (Act 1:9). His ascension corresponds to the manner of His coming again (Act 1:11). Clouds are the symbols of wrath to sinners. every eye--His coming shall therefore be a personal, visible appearing. shall see--It is because they do not now see Him, they will not believe. Contrast Joh 20:29. they also--they in particular; "whosoever." Primarily, at His pre-millennial advent the Jews, who shall "look upon Him whom they have pierced," and mourn in repentance, and say, "Blessed is He that cometh in the name of the Lord." Secondarily, and here chiefly, at the general judgment all the ungodly, not only those who actually pierced Him, but those who did so by their sins, shall look with trembling upon Him. John is the only one of the Evangelists who records the piercing of Christ's side. This allusion identifies him as the author of the Apocalypse. The reality of Christ's humanity and His death is proved by His having been pierced; and the water and blood from His side were the antitype to the Levitical waters of cleansing and blood offerings. all kindreds . . . shall wail--all the unconverted at the general judgment; and especially at His pre-millennial advent, the Antichristian confederacy (Zac 12:3-6, Zac 12:9; Zac 14:1-4; Mat 24:30). Greek, "all the tribes of the land," or "the earth." See the limitation to "all," Rev 13:8.

— Jamieson-Fausset-Brown Commentary (public domain)