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.
Philippians 4:6 (ESV)
When you are praying, you find solitude and serenity in our heart.
It helps to guard our heart from all those kind of messy thoughts, thoughts or feeling you should not have like the joylessness, anxieties or bitterness.
There is a peace in Christ Jesus through faith in His words and promises that settle in you profoundly.
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Supplication:
The action of asking or begging for something earnestly or humbly
Chimi Kyo 