Live a Pure Beloved Children (Ephesians 5:2; LD 41)

On the one hand we might feel good about ourselves because we have never had an affair.  We might think that we are better than the ones who have committed such a sin.  On the other hand we might feel horrible about ourselves because we have had an affair.  How do we humble ourselves in the Lord?  How do we approach the Lord appropriately even as struggling sinners?  Why would we humbly desire to offer ourselves to the Lord? How do we move beyond our struggle in sin to stay focused on the proper goal?