In the Lord’s Prayer we are specifically instructed to ask God for the forgiveness of our debts, or sins. Paul counted himself not to have attained; he did not consider himself already perfect. The Apostle John, one of the most saintly men of all time, the beloved of the Lord, said that if any man said he had no sin he deceived himself and the truth was not in him. A preacher, commenting on the fact that the Christian who says he has no sin deceives himself, remarked that he does not deceive anyone but himself.
John Gerstner