An excerpt from an article I no longer have,

If one’s conscience is bothering him to the point that he feels he is too guilty for God to forgive, he has the assurance of God’s Word that forgiveness is possible. The very fact that he is bothered by his sinfulness shows that the Holy Spirit has not abandoned him. 

The real danger arises, however, when one can continually violate God’s law and never feel the slightest remorse over his rebellion. The Bible’s warning should jolt the spiritually flippant out of their complacency:”