Remember Them No More

The Atonement is not a general thing that is for the whole Church. The Atonement is individual, and if you have something that is bothering you—sometimes so long ago you can hardly remember it—put the Atonement to work. It will clean it up, and you, as does He, will remember your sins no more. 

President Boyd K. Packer- April 2015 General Conference “The Plan of Happiness” 

https://www.lds.org/general-conference/2015/04/the-plan-of-happiness?lang=eng