1 Sam 28- 2 Sam 12.

Two things stood out to me which Bishop Zimmerman touched on bible study about David and Bathesheba  story,  and David showing grace to was to Saul Grandson Mephibosheth, who was 'lame in both feet'. David called for him and said... “'Don't be afraid, for I will surely show you kindness for the sake of your father Jonathan. This touched my heart. ( 2 Sam. 9).

Even though David missed the mark plenty of times, the same grace he received from God he extended it. 

This is a lesson.  Grace is not a one way street.  .