Paul is not talking about the lost of his salvation. He is talking about being disciplined enough to run the race. If one cannot be disciplined in the things of God, we will be ineffective and useless to the cause of Christ. People will see how we are living and our witness is worthless. Moreover it bring reproach upon the body of believers. We are disqualified or castaway from the ministry of God.
How many preachers (and priests for that matter) have we witnessed this occurring? Do you think a pediophile priest (or pastor) will ever be an effective witness for the cause of Christ again? They don't endanger their salvation but they certainly endanger their ministry and the ministry of others.
adokimos: failing to pass the test Original Word: ἀδόκιμος, ον Part of Speech: Adjective Transliteration: adokimos Phonetic Spelling: (ad-ok'-ee-mos) Short Definition: failing to pass the test Definition: failing to pass the test, unapproved, counterfeit.