We are more than just a sinner in the general sense; we are people who commit very specific sins. It is easy to make the open ended statement "I am a sinner", but God wants to deal with each of us regarding the personal, and specific, sins we have committed. On the day of judgement, as we stand in His presence, we will be shown our individual sins, but will we have already dealt with them, or be ready to answer for each one of them in that faithful moment like Isaiah was?