We need to help each other. Sometimes others can see us drifting long before we see it ourselves. We need to surround ourselves with those who will tell us the truth. And then we need to listen to them. In short, we must guard our minds and our heart.
Major sin draws it's power from simple choices.
That's why this second lesson is so valuable. The great thing about this story is how the story ends. We read about the birth of Perez and Zerah. You would have thought that everyone would have hated these little guys. They would have been the illegitimate children born out of an incestuous relationship.