(15) And the kings of the earth, the great men, the rich men, the commanders, the mighty men, every slave and every free man, hid themselves in the caves and in the rocks of the mountains,
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The effect of these cosmic signs from God is to produce terror in earth's populace, triggering humanity's strong drive to preserve itself. Despite mountains moving, men and women of every origin, status, and creed—from king to slave—flee for the caves under the mountains in a vain attempt to hide themselves from God (Revelation 6:15). This is reminiscent of Isaiah 2:19, a prophecy of the Day of the Lord: "They shall go into the holes of the rocks, and into the caves of the earth, from the terror of the LORDand the glory of His majesty, when He arises to shake the earth mightily."
John sees these fearful people speaking to the mountains and rocks, commanding them to hide them from the sight of God the Father and from the "wrath of the Lamb" (verse 16). Their cry, "Fall on us!" is not a death wish or a suicidal means to avoid God's judgment but a hope that the mountains will cover and conceal them. "Fall on us and hide us" is typical Hebrew parallelism, as can be seen from an Old Testament parallel in which Israelites "shall say to the mountains, 'Cover us!' and to the hills, 'Fall on us!'" (Hosea 10:8).
It is somewhat startling that earth's sinners correctly identify these catastrophic events as evidences of God's wrath. We are used to them being termed "natural disasters" and in no way a result of God's intervention in humanity's affairs. Yet, this time, these cataclysmic signs are indeed "acts of God," and men know it. Such a succession of disturbances can be nothing other than divine anger.
Further, people seek to be "out of sight, out of mind" to both the Father—"Him who sits on the throne" (Revelation 6:16)—and the Lamb, Jesus Christ. Often, the phrase "face of Him," "face of God," or "face of the LORD" suggests being in His presence (Genesis 33:10; I Samuel 26:20; II Chronicles 7:14; Lamentations 2:19; Luke 1:76). However, it can also imply being under the judgment of an angry God (see Leviticus 26:17; Psalm 34:16; Jeremiah 44:11; Lamentations 4:16; also Amos 9:4). Obviously, the latter idea fits this instance.
Initially, it seems incongruous to pair "wrath" with "of the Lamb," but it makes perfect sense on two levels. First, "Lamb" is only one title of this complex Individual, Jesus Christ, who is not a cute, cuddly, little lamb. As the Johnny Cash song, "A Boy Named Sue," relates, a person's name cannot describe his entire personality, and one may rue the day he made the assumption it could! The same Jesus Christ who took little children in His arms and blessed them also made a whip of cords and angrily drove the moneychangers from God's Temple.
Second, as it pertains to Christ, the lamb represents a sacrificial Redeemer, One who gave His life to buy back others who had been enslaved. The meaning of the symbol contemplates, not only the force of character it would take to perform such a selfless act, but also the position of mastery to which it elevated Him due to its success. In other words, the imagery of the lamb contains both the Suffering Servant and the Exalted Lord and Judge of all (John 5:22).
— Richard T. Ritenbaugh