Be anxious for nothing, 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 comprehension, shall guard your hearts and your minds in Christ Jesus. – Philippians 4:6-7
Instead of worrying, we need to pray, but the most important part of this Scripture is that we have to pray with thanksgiving. The peace of God comes when thank God for answering our prayers. Not just once. We need to pray, then continually thank Him for the answer.
It is the thanksgiving that is going to bring the manifestation of our prayers to life.