May the God of peace himself sanctify you completely. May your whole spirit, soul, and body be preserved blameless at the coming of our Lord Jesus Christ.
Be preserved entire, without blame ...  The summation of the effect of salvation of people will be their presentation "without blame" before the throne of the glory of God. This can be only by the saved being presented "in Christ"  (Colossians 1:28), and as being fully identified with Christ, in Christ and as Christ, and by no means in their own identity as perfect souls.