The beginning of anxiety is the end of faith, and the beginning of true faith is the end of anxiety, ~George Mueller
Prayer and thanksgiving breeds supernatural peace. Anxiety is a choice.
Verses
1 Peter 5:6-8 - Humble yourselves, therefore, under the mighty hand of God so that at the proper time he may exalt you, casting all your anxieties on him, because he cares for you. Be sober-minded; be watchful. Your adversary the devil prowls around like a roaring lion, seeking someone to devour.
Philippians 4:4-7 - Rejoice in the Lord always; again I will say, rejoice. Let your reasonableness be known to everyone. The Lord is at hand; do not be anxious about anything, but in everything by prayer and supplication with thanksgiving let your requests be made known to God. And the peace of God, which surpasses all understanding, will guard your hearts and your minds in Christ Jesus.
John 14:27 - Peace I leave with you; my peace I give to you. Not as the world gives do I give to you. Let not your hearts be troubled, neither let them be afraid.
(Keep Calm and Trust God by Jake Provance and Keith Provance, 2014. Page 1-6)