Philippians 4:6-8

Do not be anxious about anything, but in everything, 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, 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.

Do not be anxious about anything
Matthew 6:33-34 "But seek first his kingdom and his righteousness, and all these things will be given to you as well. Therefore do not worry about tomorrow, for tomorrow will worry about itself. Each day has enough trouble of its own."
1 Peter 5:7 Cast all your anxiety on him because he cares for you.

present your requests to God
Ephesians 6:18 And pray in the Spirit on all occasions with all kinds of prayers and requests. With this in mind, be alert and always keep on praying for all the saints.
1 Timothy 2:1-2 I urge, then, first of all, that requests, prayers, intercession and thanksgiving be made for everyone--for kings and all those in authority, that we may live peaceful and quiet lives in all godliness and holiness.

And the peace of God
Isaiah 26:3 You will keep in perfect peace him whose mind is steadfast, because he trusts in you.
John 14:27 "Peace I leave with you; my peace I give you. I do not give to you as the world gives. Do not let your hearts be troubled and do not be afraid."
Romans 5:1 Therefore, since we have been justified through faith, we have peace with God through our Lord Jesus Christ, ...

which transcends all understanding
Ephesians 3:19 ... and to know this love that surpasses knowledge--that you may be filled to the measure of all the fullness of God.

NOTES:
Read these verses also: Matthew 6:25-34, Ephesians 3:16-20.

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984 by International Bible Society. Used by permission. All rights reserved worldwide.