Sin.

"We are not horrible people.  We are just human."  

Someone told me this tonight, and I think it really is true.  Christ died for us because we are human.  We are going to mess up at one point or another, but that's the beauty of the atonement.  Obviously we shouldn't go looking for sin, but if we slip up, we can be forgiven.  The great thing about being forgiven is that you are truly forgiven.  Christ will forgive you, but you need to forgive yourself as well.  If you can't do that, then you are not truly letting the atonement take it's affect on you.  No matter where we are on the path, whether we are converts or we are a prophet, Christ just wants to see us moving forward.  As long as we are moving forward, he will be happy with us.  And we will be happy too.