Not one person can honestly claim to being sinless. Anyone however, can know he/she has been totally forgiven for all their wrongs. Anyone that is, who has confessed their wrongs to Jesus and believes He has paid the price for all their sins.

Blessed is the one whose transgression is forgiven,
    whose sin is covered. 
Blessed is the man against whom the Lord counts no iniquity,
    and in whose spirit there is no deceit.
Psalm 32:1-2 ESV_____________________________________________