As everyone who has a bird feeder knows a squirrel is very persistent in raiding the bird feeder. One scares them away only to have them return in minutes. Those who have studied squirrels say that the reason is this: a squirrel has no memory of fear. So no matter how often the owner of the bird feeder scares him away he will return. Sinners are like that. Sin brings deep dark feelings of guilt, anxiety, regret and often fear. Yet those terrible results of sin are quickly forgotten when temptation presents itself again.
-Robert Shannon, Preaching July/August 1999