There is some disagreement over "condemnation" here. Some commentators say that it ought to be translated "criticism" or "snare."
From what it says in Ezekiel 28, we can be safe in concluding that Helel was created far different from the Satan that he became, that pride led to Helel's downfall by providing motivation. It plowed the way, and it completely obliterated his knowledge of God and His power, and eventually it produced rebellion.
Paul's warning is that a converted person can fall into this snare, this criticism, or this condemnation, if he is not mature enough to fight and overcome its influence. If he does not recognize it, he is really in trouble. He will not put up any fight at all. If he does recognize it, and if he is mature, then he can overcome it because he will do the things necessary to ensure that it is in check. As long as there is a Devil, as long as we are human and have this human spirit, and as long as that spirit can be triggered by Satan, then we can fall prey to it if we are unaware of its working within us.
John W. Ritenbaugh
Faith (Part Six)
A spiritually immature person in an office of authority like this will follow the same course that Satan took. He will get a big head and try to grasp beyond his position.
Richard T. Ritenbaugh
Self-will is insisting stubbornly and arrogantly on one's way, as opposed to following the will of God. Paul states that a minister of God must not allow himself to be self-willed but must be led by and do God's will. What kind of minister would a person with false pride and stubbornness make?
Martin G. Collins
Overcoming (Part 4): Self-Will