"Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God. And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus."
"Be careful for nothing" means do not be anxious about anything. Paul does not say this lightly; he wrote it from prison. His secret was simple: turn every worry into a prayer, and wrap every prayer in thanksgiving.
The result is a peace that does not make sense. The situation may not have changed, but something stands guard over your heart and mind like a soldier at a gate.
Prayer
Father, I bring You the things that worry me. With thanksgiving I lay them before You. Guard my heart and mind with Your peace. Amen.
Today's step
Write down your top three worries, pray over each one, and thank God for one thing in each situation.