Being invisible—nonexistent you might say—is a good ploy for an ambush. The Bible refers to Satan as a lion. A British clergyman, Ron Knox, wrote, "It is so stupid of modern civilization to have given up believing in the devil when he is the only explanation of it."

Only in modern times has the devil successfully convinced so many that he doesn't exist. People have no idea they are being stalked and perhaps already in his grasp and power. Animals that stay alert and on guard can avoid this danger. Danger—what danger?