Jesus will return to earth in the same manner in which He left (Acts 1:9-11; Daniel 7:13,14; Revelation 1:7). The psalmist said that God uses “clouds” as His chariot (Psalm 104:3), and Isaiah 19:1 pictures the Lord riding on a cloud. Although these “clouds” could be natural, they more likely describe the supernatural “glory cloud” that represented God’s presence in Old Testament Israel. While Christ possesses “great power and glory,” His return will be accompanied by visible manifestations of that power and glory – He will redeem the elect, restore the devastated earth, and establish His rule on earth.
Commentary from the MacArthur study Bible, notes for Mark 13:26.