1 Samuel 12

"And all the people said to Samuel, “Pray for your servants to the Lord your God, that we may not die; for we have added to all our sins the evil of asking a king for ourselves.”  Then Samuel said to the people, “Do not fear. You have done all this wickedness; yet do not turn aside from following the Lord, but serve the Lord with all your heart...Only fear the Lord, and serve Him in truth with all your heart; for consider what great things He has done for you." vv.20-21, 24

Read chapter 12 

So as Saul is now becoming king Samuel is giving his final judging as judge and prophet over Israel.  He reminds them of their wickedness in asking for a king but that they should continue after the Lord still and not continue in their wickedness.  That definitely shows the Lord's mercy and forgiveness of not a "one and done" kind of way towards His people.  How easy it is for us to think that once we've messed up it's over with so we only have the option to sit in it.  Because of Christ and His sacrifice on the cross we have forgiveness for all our sins even before we commit them if we believe and worship Him as God.  So let us not continue in them just because we're forgiven or because we don't think we can be forgiven.   Samuel tells them an amazing command that we should still live by today: "Fear the Lord and serve Him in truth with all your heart."  To fear the Lord is to revere Him, to stand in awe of Him.  And to serve Him in truth is to do it according to His word and not our own.  To know His truth you need to know Him.  So how will you dig deeper in His truth to serve Him with all your heart?  One of my favorite verses in scripture is 3 John 4 "I have no greater joy than to hear my children walk in truth."