Self-controlled, upright, holy and disciplined

Titus 1:5-16
An elder must be blameless, faithful to his wife, a man whose children believe and are not open to the charge of being wild and disobedient. Since an overseer manages God’s household, he must be blameless—not overbearing, not quick-tempered, not given to drunkenness, not violent, not pursuing dishonest gain. Rather, he must be hospitable,one who loves what is good, who is self-controlled, upright, holy and disciplined.  He must hold firmly to the trustworthy message as it has been taught, so that he can encourage others by sound doctrine and refute those who oppose it.
To the pure, all things are pure, but to those who are corrupted and do not believe, nothing is pure. In fact, both their minds and consciences are corrupted. 
Is it the thought of the Cretans and their lies that makes Paul dwell on the dependability of a God's who does not lie? The promise of eternal life which he holds out is utterly reliable.
For the qualifications of church leaders see on 1 Timothy 3. The requirement that any leader of the church must hold firm to 'the trustworthy message' leads straight into a description of those who flout this. They are rebellious talkers and deceivers, teaching what they should not teach. The situation is so bad it calls for a really strong line - a sharp rebuke to those who propound 'Jewish myths' and other who reject the truth.
Why?
To be a Christian should be live like requirement as elder.
To be pure and may encourage other by sound doctrine and refute(反駁) those who oppose it.
How?
May my mind and my heart could be pure before the Lord and could be a man to fight against corruption accompany with Jesus Christ.