7. How did the ancient world come to be filled with violence?

⁷ In the time of Enoch’s great-grandson Noah the invisible wicked one, Satan, was joined by angelic reinforcements. These were spirit sons of God who disobeyed him by coming down to earth to marry the daughters of men, producing by them a hybrid offspring​—the Nephilim. This name means “Fellers,” and true to that designation they pursued their murderous way among mankind. “They were the mighty ones who were of old, the men of fame. . . .

—Genesis 6:1-13.