Titus 2:12, "It teaches us to say, “No” to ungodliness and worldly passions, and to live self-controlled, upright and godly lives in this present age, …”

Interesting points:
1. In this verse, Paul builds on the previous verse concerning the grace of God which brings salvation as well as a change in actions, two which are presented here.
First, God's grace teaches us to turn away from worldly, unrestrained, godless behaviors. The original Greek uses two words with similar meanings. One is translated as "ungodliness" or "godlessness", the other as "worldly passions" or "worldly lusts." Ungodliness is simply anything which contradicts God's will or His nature. God's grace helps us Christians reject ungodly living. It also helps us reject sinful desires. God's grace trains and teaches us to avoid sinful behaviors.

3. Second, God’s grace helps us live with self-control, morality, and godliness. "Self-control" is an idea frequently mentioned in Paul's letter to Titus. It emphasizes the importance of a disciplined life. This attitude was in sharp contrast to the lazy, self-focused lifestyle of many people in Crete mentioned in Titus 1:12–13.

Application.
Brothers, this verse echoes of James 4:7 which says, “Submit yourselves, then, to God. Resist the devil, and he will flee from you.” In this verse we gain insights. In accepting God’s grace and submitting ourselves to obey Him, we learn to repent and avoid/overcome the temptations of this sinful World.
What a friend we have in Jesus, especially as we learn to lean on Him rather than on our own strength!
As we learn to follow as our Lord leads and develop discernment, may we develop self-control, discipline and how to truly fight our spiritual battles using God’s power rather than with the force of our own willpower.