“In everything,” means EVERYTHING by prayer and supplication. Prayer and supplication is joined with thanksgiving. Prayer is a broad term used for communication with God and supplication is best described as a petition or request. Thanksgiving encourages prayer to be about our relationship with God rather than empty or repetitive words spoken out of habit or comfort.
Offering thanksgiving from a grateful heart for anything praiseworthy draws attention to our heavenly Father, who He is, and what He has done for us and is focused on TRUTH. Our perspective may include flaws or half truths and not be a true view. God’s view is CLEAR, TRUSTWORTHY, JUST, and TRUE.