Isn’t it interesting that we see Isaac following in the footsteps of his fathers sin? Abraham mislead others about his wife twice, and we find Isaac doing the same thing here. My guess is that, in a society that valued oral history, Isaac probably heard the stories many times over the years. Perhaps Abraham recounted how God saved him from himself! Isaac apparently internalized the story, because he did the same thing. But note that he didn’t do it thinking that God would save him. He did it trying to save himself: “Because I was afraid someone would kill me to get her from me.”
The warning for us is that our children, and even others, are paying attention. I am reminded of a saying of Jesus that should be chilling for those of us who are parents: “But if you cause one of these little ones who trusts in me to fall into sin, it would be better for you to have a large millstone tied around your neck and be drowned in the depths of the sea” (Matthew 18:6).