One of the ways God leads us by the Holy Spirit is through the "peace of Christ." It is a supernatural peace that surpasses understanding (Philippians 4:7). We receive it when we place faith in Jesus and it is something we'll likely grow more sensitive to as we walk with the Lord. Paul said that this peace should rule our hearts at all times. It is to act as a type of spiritual umpire, helping us make godly decisions.
When we make bad decisions that lead us into sin, we will "lose our peace" and will likely feel a conviction from the Holy Spirit concerning our sin. Our sin may open the door to confusion, strife, lust or anger, all of which steal or destroy our peace. Ultimately sin can replace the peace of Christ as the ruler of our hearts if we let it (Romans 6:16).
Temptations to sin often involve anxiousness that appeals to our desires. If we can resist that anxiousness and direct our requests to God, his peace will provide supernatural protection over our hearts and minds.
What have you been tempted to be anxious about recently?