We know what happens when we bring them before the Lord and confess our sins....
1 John 1:9
If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
Psalm 103:12
As far as the east is from the west, so far hath he removed our transgressions from us.
Isaiah 43:25
I, even I, am he that blotteth out thy transgressions for mine own sake, and will not remember thy sins.
and from SOP:
'Whatever the character of your sin, confess it. If it is against God only, confess only to Him. If you have wronged or offended others, confess also to them, and the blessing of the Lord will rest upon you. In this way you die to self, and Christ is formed within. . . .' {TMK 239.3}
'When, under the temptations of Satan, men fall into error, and their words and deportment are not Christlike, they may not realize their condition, because sin is deceptive and tends to deaden the moral perceptions. But through self-examination, searching of the Scriptures, and humble prayer, they will, by the aid of the Holy Spirit, be enabled to see their mistake. If they then confess their sins and turn from them, the tempter will not appear to them as an angel of light, but as a deceiver. . . .' {TMK 239.4}
But if we have sins of ommission or unknown sin, or if we backslide into sin what happens?