This talk -- the delivery and the content -- encapsulates everything that is right in the world.
testifying of Christ
love in theory
love in practice
The video loaded very slowly for me, so here is the text if you're in a hurry. Although if you skip the video, you will miss a very touching part, my favorite: a visual representation of love and the reason I linked to this particular talk of Elder Wirthlin's. Help from Elder Nelson.
He died last night, and I'm really happy for him.