"Faithful is the saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners; of whom I am chief:" (ASV)
This book and particularly this verses is written by Paul. If you don't remember Paul was formally named Saul until his conversion through his encounter with Christ. It is safe to assume that since Paul had the job of persecuting citizens that he was an influential and rich member of society. Living this lifestyle I believe Paul lived a very sinful life whether it be through drugs, sex and money. After Paul was converted he had a lust and a fire for God which changed the course of history. The thing I love about Paul is he remained transparent throughout his teaching. Paul knew people knew the man he used to be and wouldn't listen to his message if he was acting "holier than thou".
As a Christians we must own up to all our past mistakes and become an example needed for younger followers and unbelievers. People who knew our past lives and know our past sins will think we are being hypocrites unless we are willing to be transparent with our past mistakes.
I believe in order to draw others closer to God we may have to open up our secret closets and give unbelievers, younger Christians a full tour (even showing them the skeletons in the dark corners of your secret closet)
Are you willing to show them you will to be transparent? what is hold you back?