Many a times we try to hide things from the Lord. Of course, we all know that we can't. And many times we try to find ways and means to make ourselves excusable of things we have done.
Well, the Lord knows, just like He knew about David and Bathsheba, He sent Natan to talk to David. The Lord sees our heart. He knows us, He created us.
Just a simple reminder to everyone of you... no matter what you do, the Lord sees and knows. Eventually, one day, we will have to account to Him.