Christians will be blameless in the end

"God will establish you to the end: blameless in the day of our Lord Jesus Christ. Faithful is God, by whom you were called into communion with his son, Jesus Christ, our Lord." That is what Paul wrote to the Corinthians who "call on the name of the Lord Jesus Christ." How can that be? They (like me) clearly were not perfect. Yet, we are told that they will be free of any charge (i.e., blameless). And the source of this information isn't just any man or just one man. This was proclaimed by many men who each identified one source of this good news: the God of the universe, the Lord of heaven and earth, revealed it to them through his son, Jesus Christ.