Repent and Believe!

Alma 19:36

"And thus the work of the Lord did commence among the Lamanites; thus the Lord did begin to pour out his Spirit upon them; and we see that his arm is extended to all people who will repent and believe on his name."

The wicked Lamanites repented and believed in Christ. They were able to change themselves because of the Gospel. They became righteous and happy. All people can repent, change their ways, and come unto Christ. They just need to want it and work for it.