What does Revelation 6:7 mean?

When the Lamb opened the fourth seal, the fourth living creature (Revelation 4:6–8) said, "Come!" It is noteworthy that each command to come brings an immediate response from a rider. Certainly, these horsemen are messengers of Satan to hurt and damage the inhabitants of earth, but their actions fulfill God's will to judge unbelievers.

Throughout history, Satan has tried to damage God's creation, especially God's people. At times, this involvement has been through temptation, indirect influence, and other means (1 Peter 3:8). He plotted to persuade Adam and Eve to sin and thereby experience death and corrupt the human race (Genesis 3:1–7). He drew humanity into constant evil in the time of Noah, prompting God to destroy the earth with a flood (Genesis 6:5). He tried to wipe out Israel during the captivity in Egypt (Exodus 1:8–22) and in the time of Esther (Esther 3:5–6). His evil attempts to destroy God's plan to bring redemption through Jesus included Herod's slaughter of the Hebrew children (Matthew 2:16–18) and various efforts to destroy Jesus before He voluntarily died on the cross for our sins (Matthew 4:1–11; Luke 4:29–30; John 10:39). No doubt, Satan delighted to see the damage and destruction inflicted by the four horsemen of Revelation 6.