Why is grace foundational to peace in Christianity?

In 1 Thessalonians 1:1, Paul notes that grace always precedes peace. This order is profoundly theological; grace signifies God's unmerited favor bestowed upon sinners, and it is only through grace that believers can attain peace with God. Romans 5:1 reinforces this by stating that having been justified by faith, we have peace with God through our Lord Jesus Christ. Understanding this relationship is essential for Christians as it reassures them of their security in Christ, allowing them to experience peace even amid life's turmoils.