I love the stripling warriors! They are one of the greatest examples to follow in the book of mormon!
Because of the Atonement we can overcome ALL things. Not just sin but any pain, sadness, ill feelings, guilt, remorse, all things are covered by the Atonement.
We know we are forgiven when we feel the Spirit because the Spirit can't dwell in unclean tabernacles, so when you feel the Spirit you know that the Cleansing process is done!
We will still have guilt but as we forgive ourselves and forget about the past, the guilt goes away, but when we remember those things, the guilt comes back.
I have no idea why I wrote this but it just happened :)