Verses from Philippians

应当毫无忧虑，只要凡事借着祷告祈求，带着感恩的心，把你们所要的告诉神。这样，神所赐超过人能了解的平安，必在基督耶稣里，保守你们的心思意念。最后，弟兄们，凡是真实的、庄重的、公正的、纯洁的、可爱的、声誉好的，无论是甚么美德，甚么称赞，这些事你们都应当思念。(腓立比书 4:6-8)

Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God. And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus. Finally, brothers and sisters, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable—if anything is excellent or praiseworthy—think about such things. (Philippians 4:6-8)

When faced with a situation that causes us to feel anxious, let's learn to find something to give thanks instead, find something positive to think about, and know that He is a sovereign God, still in control of everything in the world, the peace which only God can give will come after that, and when we earnestly seek Him for help in those situations. 

Our behavior, whether we react or respond is linked to our thoughts, on how we perceive things.