The Hebrew word shalom is routinely translated "peace," but that rendering loses almost everything. Shalom means wholeness, completeness, nothing missing and nothing broken. It's a state of total alignment — body, soul, relationships, standing before God. When the Old Testament describes a person as having shalom, it means their entire world is in order. The Greek eirḗnē, used in the New Testament, inherits that fullness rather than replacing it with mere calmness.
Jesus's farewell in John 14:27 is worth reading slowly: "Peace I leave with you, my peace I give unto you: not as the world giveth, give I unto you." He distinguishes his peace from worldly peace explicitly. The world's peace is circumstantial — it depends on nothing bad happening. His peace is a possession left to you like a will is left to an heir. It doesn't fluctuate with the news cycle.
Charismatic theology holds that the peace of God is not just an emotion but a spiritual entity — a guard. Philippians 4:7 describes it as something that "shall keep," using the Greek phroureō, a military term for a garrison of soldiers. The peace of God is not passive contentment. It actively defends your heart and mind against the things that want to destabilize them.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.