Finally, after speaking about the millennial condition, Nephi said, "There is nothing which is secret save it shall be revealed." Every work of darkness will "be made manifest in the light." Does this change the way you live—knowing that everything you say and do is going to be revealed?
I think that if you repent, your wrongdoings will be erased from the disc, so that when the events of your life are played, the things that you have repented of will be just a blip. We are going to have all eternity, and what is one thing we will do? Maybe we are going to watch everybody’s home movies. We’re going to see everybody’s life replayed so that we can learn from one another and laugh with each other. "Oh, you had that problem too?" This scripture informs us that everything we do will be shouted from the rooftops for all to see and to hear.
The Lord says that when we repent, "I, the Lord, remember [the sin] no more." In some miraculous way, repentance provides an omniscient God who knows everything to forget something. Now how can that happen? I don’t know, but it does.
But for the unrepented parts of our lives, I think the reality spelled out in verses 17 and 18 can be a big motivator for us: everything will eventually be manifest. Sometimes we sweep things under the rug and ignore them. We think nobody will ever know. However, if we’re going to have integrity, if we’re going to be pure, if we are really going to have the kind of love and respect for God that it will take to regain his holy presence, we must recognize that everything secret will be revealed—all cards will be on the table. Nephi leaves us with this warning as an important thing for all to keep in mind every day.