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.
The thought
Paul is chained to a wall when he writes this, which rules out "he just had it easy." Look at the small phrase in the middle: with thanksgiving. Not when you feel thankful. With it — as a direction you point yourself in. Here's why it works: you can't genuinely be thankful without thinking about something real and good about God, which means thankfulness is a mechanism, not a mood. It's how you get your mind stayed on him when it doesn't want to go there on its own.
Think about it
Name one thing that's actually true about God — not a nice thought, something true. Write it somewhere you'll see it tomorrow.