Repentance.

"Repentance is of fundamental importance to man as it is to God. Its effects are not only felt and seen on earth but manifest in heaven too, repentance was one of Jesus’ first messages. It was one of his central topics too. Many of Jesus’ teachings and especially his parables include an element of repentance." 

-from http://www.atotheword.com/2011/01/09/jesus-teaches-importance-of-repentance-with-parable-of-lost-sheep/

Plagiarism in blogging is a wrong thing to do. So i include the link to this as well. Its one blog that I recommend!

God says repent and sin no more.

Yes indeed. Repent, and sin no more. =)