There is a part of the sea known as "the cushion of the sea." It lies beneath the surface that is agitated by storms and churned by the wind. It is so deep that it is a part of the sea that is never stirred. When the ocean floor in these deep places is dredged of the remains of plant or animal life, it reveals evidence of having remained completely undisturbed for hundreds, if not thousands, of years.
The peace of God is an eternal calm like the cushion of the sea. It lies so deeply within the human heart that no external difficulty or disturbance can reach it. And anyone who enters the presence of God becomes a partaker of that undisturbed and undisturbable calm.