Titus 3:1-15 - Get a grip

In a situation like that in Crete respect for government is likely to be low. Now the government might not exactly be a paragon of virtue, nevertheless we are to be subject to rulers and authorities. Paul then clarifies this with the instruction to be "obedient, ready to do whatever is good, to slander no one, to be peaceable, considerate and gentle to everyone". These qualities are the exact opposite of what rebellious groups do.

Once we too were enslaved by all kinds of passions, and were foolish. The evil behaviour in society is good for no-one, least of all those who perpetrate the behaviour. If we sin, we become slaves to sin.

The gospel is a message of repentance and as such is an act of kindness on God's part for He is saving us from our sins. This is not a cause for pride on our part, for it is purely an act of grace and mercy on God's part. We are cleansed by new birth, ie through faith in what Jesus did on the cross, and we are renewed by the Holy Spirit. Forgiveness and renewal go together. 

We are justified by His grace and have the hope of eternal life, a glorious inheritance. So we are to devote ourselves to doing good. We are to take a grip of our lives because God has taken a grip of us. We are to live as wise, not as foolish (Eph 5:15).  The converse of this are people who are divisive, all they do is cause trouble.
Paul had several people who helped him in his missionary work, and Titus is to work with them.
Verse 14 describes a lifestyle that was very contrary to that which the Cretans were apparently used to. Likewise there are segments of our society where people have a dependency culture and always expect things to be done for them. The gospel runs counter to that. God created all of us to be useful, to be a benefit and a blessing to others. Part of the fruit of the gospel is that we learn to fulfil this goal.