God said his people should be ashamed of their sins. The people had become so callous that they had lost all sensitivity to sin. First they had to remember their sins, then despise them, and finally repent of them. As we examine our lives, we may find that we too have lost our sensitivity to certain sins. But if we measure ourselves against God's standard of right living, we will be ashamed. To regain sensitivity we must recognize our sin for what it is, feel sorry for displeasing God, and ask his forgiveness. The Holy Spirit will guide us, making us responsive and receptive to God's truth.
God said that if the people asked, he would come to their aid. We cannot expect his mercy, however, until we have sought new hearts from him. We can be thankful that his invitation is open to all.
Reference summary used from The Life Application Bible, KJV, Tyndale Publishers, Inc., Wheaton, IL