Pastor Rod Carver continues in Nehemiah Chapter 4. God really has a heart for His people who have returned from captivity, but still 12 years later, the walls of their city, Jerusalem, were defenseless and very vulnerable as a country. So as the walls were being built, the people around them were angry because now the Israelites would be safe. What often happens physically in the Old Testament, you can look to the New Testament and see that it is spiritually true.
And so today when you repent from a backsliding and we turn back to God, we put up a defense against sinful living and others around us who don't know Jesus become angry because they can no longer influence us and cause us to sin. God is the Perfect Defense!