Behold, He is coming with clouds, and every eye will see Him, even they who pierced Him. And all the tribes of the earth will mourn because of Him. Even so, Amen. – Revelation 1:7

We are told that His coming will be attended by a peculiar sign. “Behold, He comes with clouds.” We shall have no need to question whether it is the Son of Man who has come, or whether He is, indeed, come. This is to be no secret matter—His coming will be as manifest as yonder clouds! In the wilderness, the Presence of Jehovah was known by a visible pillar of cloud by day and an equally visible pillar of fire by night. That pillar of cloud was the sure token that the Lord was in His Holy Place, dwelling between the cherubim…So it is written, “And then shall appear the sign of the Son of Man in Heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of Man coming in the clouds of Heaven with power and great glory.”

Is it not to show that His coming will be majestic? He makes the clouds His chariots. He comes with hosts of attendants and these of a nobler sort than earthly monarchs can summon to do them homage. With clouds of angels, cherubim and seraphim and all the armies of Heaven He comes! With all the forces of nature, thundercloud and blackness of tempest, the Lord of All makes His triumphant entrance to judge the world! The clouds are the dust of His feet in that dread day of battle when He shall ease Him of His adversaries, shaking them out of the earth with His thunder and consuming them with the devouring flame of His lightning! All Heaven shall gather with its utmost pomp to the great appearing of the Lord and all the terrible grandeur of nature shall then be seen at its fullest. Not as the Man of Sorrows, despised and rejected of men, shall Jesus come, but as Jehovah came upon Sinai in the midst of thick clouds and a terrible darkness, so shall He come, whose coming shall be the Final Judgment! ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1989.cfm