2 Nephi 6

In Chapter 6 of 2 Nephi, Jacob is now teaching the Nephite people from the words of Isaiah. But my favorite part is in verse 13 which reads:

". . . the people of the Lord shall not be ashamed. For the people of the Lord are they who wait for him; for they still wait for the coming of the Messiah."

When Jesus Christ comes to the earth again, the people of the Lord will not be ashamed or afraid of going forth to meet the Savior. They won't be wanting to hide any sins. They will know of the power of the Atonement and so, in preparation for meeting the Savior, they will have tried to live as righteously as they could and repent of their mistakes. They would have done so before the coming of the Lord because they've been waiting. In preparation for waiting they would have prepared themselves as much as they could so they could go forth to meet the Savior when he comes in his own timing.
It's like the Parable of the Ten Virgins. In order for us to partake of the Second Coming and all that entails, we have to be prepared and ready to answer the call whenever it comes.