In General Conference of 1985, Bruce R. McConkie gave a talk titled "The Purifying Power of Gethsemane". He wasn't in very fit condition to give a talk at the time, but he thought it was necessary. Some call it his "last testimony", because he passed away three days later. I never heard it, or of it, until yesterday when our home teachers came over and one of them mentioned it. I asked him what year it was that he heard it, then I searched for it online. If you haven't heard it, you can download it or read it at one of the links below.
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Is this about Bruce R. McConkie or about the Atonement? If about the Atonement then there are existing Threads already about this - see the Focus on Christ Board. If it is about Bruce then look for the Historic Profiles Thread.