"Learning the lessons of the past allows you to walk boldly in the light without running the risk of stumbling in the darkness. This is the way it’s supposed to work. This is God’s plan: father and mother, grandfather and grandmother teaching their children; children learning from them and then becoming a more righteous generation through their own personal experiences and opportunities. Learning the lessons of the past allows you to build personal testimony on a solid bedrock of obedience, faith, and the witness of the Spirit."
Read the entire talk here: “Learning the Lessons of the Past,” Ensign, May 2009, 31–34